Term
Neurons communicate with other neurons and stimulate both _____ and ______. |
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Definition
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Term
what are the part of the neuron is the input area which receives signals from other neurons? |
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Definition
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Term
what is the main nutritional and metabolic area of the neuron (as well as an input area)? |
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Definition
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Term
what is the conductive region of the neuron that generates an action potential? |
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Definition
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Term
signals from other neurons are received at junctions called: |
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Definition
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Term
The area where the axon emerges from the soma is called the: |
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Definition
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Term
an action potential is generated from: |
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Definition
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Term
an axon can branch forming what? |
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Definition
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Term
at the end, axons branch, forming axon: |
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Definition
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Term
what support cell forms the myelin sheath? |
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Definition
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Term
myelin is found around which part of the neuron |
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Definition
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Term
the tightly wound cell membrane around the axon forms the myelin sheath and acts as a ? |
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Definition
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Term
the gaps between the Schwann cells, called the _________________, are essential for the conduction of the action potential. |
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Definition
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Term
the most common central nervous system neuron is called a _________ neuron. |
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Definition
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Term
_______ neurons are found in the: |
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Definition
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Term
neurons have (only one or many) axon/s? |
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Definition
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Term
axons are (never or frequently) branched. |
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Definition
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Term
Dendrites have (only one or many) branch/s. |
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Definition
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Term
what triggers an action potential? |
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Definition
resting membrane potential and ion channels. |
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Term
what dictates a neuron's resting membrane potential? |
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Definition
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Term
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Definition
any shift from a resting potential to a positive potential. |
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Term
what is hyperpolarization? |
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Definition
an increase in negativity from resting potential. |
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Term
repolarization does what? |
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Definition
restores normal resting potential. |
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Term
which channels help to maintain the resting potential? |
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Definition
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Term
what is myasthenia gravis? |
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Definition
Myasthenia Gravis is a chronic neuromuscular disease. The disease is characterized by abnormal weakness of voluntary muscles.
With this disease, antibodies bind to ACh receptors and help destroy the post-synaptic membrane and it's Na+ channels, reducing the ability for action potentials to pass along the post synaptic membrane (in fact there is less post synaptic membrane in MG) |
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Term
What is an axoaxonic synapse? |
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Definition
when the axon of one neuron synapses with the presynaptic terminal (axon) of another. Many of the synapses of the CNS are axoaxonic. |
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Term
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Definition
reduction in the amount of neurotransmitter released from presynaptic terminal. For example, endorphins can inhibit pain sensation this way. |
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Term
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Definition
amount of neurotransmitter released from presynaptic terminal increases. Example: glutamate facilitating nitric oxide production. |
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Term
What is multiple sclerosis? |
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Definition
a disease characterized by recurrent incidents of de-myleination that affects axons in the optic nerve, brain and spinal cord. |
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Term
a typical stimulus produces a temporary, localized change in the resting potential of a cell membrane. The effect, which decreases with distance from the stimulus is called a: |
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Definition
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Term
if the graded potential is significantly large it triggers an: |
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Definition
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Term
synaptic activity produces graded potentials in the plasma membrane of the postsynaptic cell. This process typically involves the release of __________ by the presynaptic cell. these compounds bind to receptors on the postsynaptic plasma membrane , changing it's permeability. |
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Definition
neurotransmitters, ex: ACh (comparable to the event in sliding filament theory) |
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Term
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Definition
ion channels that are always open. |
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Term
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Definition
open or close in response to specific stimuli. |
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Term
3 types of gated channels are: |
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Definition
chemically gated, voltage gated and mechanically gated. |
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Term
a localized depolarization or hyperpolarization is: |
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Definition
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Term
__________ arises when a region of excitable membrane depolarizes to its _________. |
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Definition
action potential, threshold. |
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Term
steps of an action potential (quick and dirty) |
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Definition
1. membrane depolarization to threshold, activation of sodium channels and rapid depolarization. 2. inactivation of sodium channels and activity of potassium channels 3. return to normal permeability. |
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Term
action potentials follow which principle? |
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Definition
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Term
what is the refractory period? |
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Definition
the time an action potential begins up until the normal resting potential has returned. (all cylinders are firing so it will be impossible for the cell membrane to do anything else until resting potential returns) |
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Term
what happens to the postsynaptic cell after a neurotransmitter is released? |
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Definition
a depolarization occurs (which is a graded potential) and if there is a very large number of ACh and that brings the adjacent area to threshold, then an action potential will appear at the postsynaptic membrane. |
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Term
what are some examples of cutaneous senses? |
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Definition
touch, pressure, temperature, pain, vibrations |
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Term
cutaneous receptors can be either encapsulated or non-encapsulated. Give the names of the 2 non-encapsulated cutaneous receptors: |
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Definition
hair follicle receptor and free nerve ending |
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Term
Give some examples of encapsulated cutaneous sense receptors: |
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Definition
meissner corpuscle, ruffini end organ, pacinian corpuscle. |
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Term
The only major sensation relayed directly to the cerebral cortex without passing through thalamus |
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Definition
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Term
receptors that mediate the gustatory sense: |
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Definition
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Term
3 types of papillae are used in the sensation of taste, which are they: |
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Definition
Circumvallate papilla- help to rapidly detect taste change and for salvation, contain many taste buds Filiform papilla- make tongue rough to manipulate food, no function Fungiform papilla- contain a few taste buds. |
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Term
The 5 types of taste are: |
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Definition
salty, sweet, bitter, umami and sour |
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Term
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Definition
Auricle (Pinna) External auditory meatus (ear canal) Tympanic membrane (eardrum) |
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Term
malleous, incus and stapes are the: |
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Definition
auditory ossicles, they are components of the middle ear |
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Term
the auditory tube is also known as the: |
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Definition
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Term
the inner ear is composed of: |
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Definition
Cochlea Vestibule Semicircular canals |
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Term
what is the structure of the cochlea? |
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Definition
Scala vestibuli & Scala tympani on either side of the cochlear duct filled with perilymph
Cochlear duct filled with endolymph |
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Term
what is the pathway of sound? |
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Definition
Tympanic membrane --> Auditory ossicles -->Oval window --> Perilymph in Scala Vestibuli --> Vestibular membrane (+ Endolymph) --> Basilar membrane -->Perilymph in Scala Tympani --> Round window |
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Term
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Definition
At the entrance to the inner ear is the VESTIBULE which contains two sacs of fluid called the UTRICLE and the SACCULE which are floating in perilymph. They are sensory organs responsible for detecting and transmitting information regarding balance, position in space, acceleration, and deceleration. Suspended in the fluid are calcium carbonate particles called OTOLITHS. As the head moves from one position to the other, these ear stones will move too. The otoliths brush against sensory nerve hairs that line the utricle and saccule, which depolarize and send a message to the brain. |
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Term
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Definition
The SEMICIRCULAR CANALS contain fluid and are responsible for detecting changes in motion. There are three semicircular canals (all at different angles), each responsible for detecting motion on a different plane. Within the canals are nerve hairs which sense changes in the movement of the perilymph fluid and depolarize, thus sending a message to the brain. Ex: spinning in a circle |
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Term
passive leak ion channels are: |
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Definition
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Term
ligand gated ion channels: |
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Definition
must have specific stimulus to open it (Na+) |
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Term
voltage gated ion channels |
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Definition
activated by changes in electrical potential difference near the channel; these types of ion channels are especially critical in neurons, but are common in many types of cells. |
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Term
mechanically gated ion channels: |
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Definition
open or close in response to specific distortion (ex: pressure) |
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Term
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Definition
changes in the trans-membrane potentials that cannot spread far from the site of stimulation. |
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Term
which ion channels respond to temperature sensors in the skin? |
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Definition
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Term
what triggers an action potential? |
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Definition
resting membrane potential and ion channels |
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Term
how is an action potential conducted down the axon? |
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Definition
ion channels and action potentials, myelination & saltatory conduction/nodes of ranvier, types of fibers |
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Term
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Definition
occurring at a single synapse when a second EPSP arrives before the effects of the first have disappeared |
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Term
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Definition
resulting from the cumulative effects of multiple synapses at various locations. |
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Term
hyperpolarization of the postsynaptic membrane is an: |
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Definition
inhibitory postsynaptic potential (IPSP) |
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Term
a depolarization caused by a neurotransmitter is an: |
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Definition
excitatory postsynaptic potential or EPSP |
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Term
relative vs. absolute refractory period |
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Definition
relative begins when the sodium channels regain their normal resting contition whereas absolute refractory period happens when the membrane cannot respond to ANY further stimulus. |
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Term
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Definition
largest, myelinated.. action potentials are fastest |
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Term
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Definition
smaller myelinated axons, slower but still faster than type C |
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Term
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Definition
unmyelinated and very small, action potentials move at a leisurely pace. |
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Term
After ACh has been released, bound to receptor and depolarizes the postsynaptic membrane what happens? |
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Definition
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Term
what happens when norepinephrine is released? |
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Definition
It has an excitatory, depolarizing effect on the postsynaptic membrane. |
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Term
If the neurons that produce dopamine are damaged or destroyed, the result can be the characteristic rigidity and stiffness of: |
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Definition
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Term
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Definition
selective serotonin re-uptake inhibitors increase serotonin concentrations at synapses and over time, the increase may relieve symptoms of depression. |
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Term
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Definition
generally has an inhibitory effect on cell membranes |
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Term
which part of the eye protects the surface of the eye, lubricates the eye and prevents debris from entering the eye? |
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Definition
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Term
what is the name of the mucous membrane that lines the inside surface of the eyelid and the anterior of the eye? |
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Definition
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Term
what is the name of the gland that is superior and lateral to the eye and produces tears? |
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Definition
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Term
how many muscles of the eye exist? |
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Definition
6-- superior, inferior, medial oblique/rectus |
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Term
what is the name of the opening of the eye where light enters? |
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Definition
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Term
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Definition
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Term
which structure controls the size of the pupil to control the amount of light that is let into the eye? |
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Definition
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Term
what is the name of the dense avascular connective tissue around the eye? |
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Definition
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Term
this structure has 2 componenets: _____ is the white part of the eye and is continous with the cornea. It provides mechanical support to the eye and is the site of attachment for the extrinsic eye muscles. |
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Definition
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Term
the _____ bends rays of light (eyes) |
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Definition
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Term
the anterior chamber of the eye is filled with ________ humor, which is similar in structure to CSF. |
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Definition
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Term
the _______ gives a person his or her eye color. This structure also has 2 smooth muscles that control its diameter. |
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Definition
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Term
the iris attaches to the ______ which uses a ciliary muscle to focus the lens and also produces aqueous humor. |
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Definition
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Term
the ______ is also known as the vascular tunic. It consists of the iris, the ciliary body and the choroids. |
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Definition
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Term
the _______ provides nutrients to the 3 layers of the eye |
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Definition
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Term
a _______ connect the lens to ciliary muscles |
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Definition
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Term
the largest chamber of the eye is the |
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Definition
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Term
the posterior cavity is filled with: |
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Definition
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Term
the neural layer of the retina contains 2 types of photoreceptors: ____ and ______. These two types of photoreceptors are not distributed evenly within the eye. |
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Definition
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Term
rods are mostly found within the _______ of the retina. |
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Definition
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Term
the macula lutea contains only ________. |
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Definition
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Term
The macula lutea contains a depressed spot called the: |
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Definition
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Term
the blind spot is because of and also known as the: |
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Definition
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Term
the external ear consists of the ________ which is also known as the pinna. |
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Definition
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Term
the tympanic membrane is also known as the: |
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Definition
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Term
the ________ is an air filled tube that is also known as the pharynogotympanic tube that equalizes air pressure between the ear and the surrounding atmosphere. |
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Definition
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Term
in the inner ear, this structure forms a spiral shape: |
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Definition
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Term
the cochlea contains the vestibular complex, which contains receptors for: |
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Definition
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Term
the cochlea consists of the _____ and the _________. |
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Definition
cochlear duct, bony cochlea |
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Term
the cochlear duct is also known as the membranous labyrinth and is filled with |
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Definition
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Term
the bony cochlea is also known as the bony labyrinth and is filled with: |
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Definition
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Term
in the middle ear, the malleus, incus and stapes are also known as the: |
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Definition
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Term
the stapes rests on the ______ window. sound then is eventually transmitted to the _____ window. |
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Definition
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Term
In the organ of Corti, hair cells touch the ________ membrane. |
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Definition
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Term
In the vestibule, two structures called the _______ and _________ are important in detecting gravity. Hair cells in the macula are embedded in gelatin containing otoliths. |
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Definition
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Term
In the semicircular canals, angular momentum is detected in the _______, which contains endolymph. |
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Definition
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Term
which cranial nerve is the largest? |
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Definition
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Term
which cranial nerve is the only one that exits the posterior side of the brainstem? |
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Definition
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Term
which cranial nerves are responsible for eye movement |
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Definition
oculomotor (3), trochlear (4), and abducent (6) |
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Term
which 3 nerves carry gustatory (taste) information? |
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Definition
facial, olfactory and glossopharyngeal |
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Term
which cranial nerve is the longest? |
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Definition
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Term
which sensory nerves carry information about blood pressure to the brain? |
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Definition
glossopharyngeal (9) and vagus (10) |
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Term
this cranial nerve is associated with balance and hearing |
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Definition
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Term
which nerve can be tested to see if tongue movement is impaired? |
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Definition
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Term
the middle ear is the air filled portion of the ear located within the _______ portion of the temporal bone. |
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Definition
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Term
how can drug use (heroin) cause a person to acquire symptoms of Parkinson's disease? |
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Definition
parkinson's disease is caused by a drastic breakdown of dopamine in the substantia nigra. drugs like heroin attack this region of the brain causing a drastic loss of dopamine and symptoms of Parkinson's. |
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Term
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
metencephalon (then becomes cerebellum and pons) and myelencephalon (then becomes medulla oblongata) |
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Term
In the spinal cord gray matter is found on the inside and white matter on the outside. what is white and gray matter? |
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Definition
gray matter: soma's are unmyelinated white matter: mylenated axons |
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Term
in the brain _____ matter is deepest and ____ matter is most superficial. |
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Definition
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Term
basal cell nuclei refer to |
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Definition
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Term
In the corpus quadramina (midbrain) the superior colliculus is responsible for: |
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Definition
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Term
In the corpus quadramina of the midbrain, the inferior colliculi are responsible for: |
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Definition
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Term
the red nucleus is located in the _______ and is responsible for ________. |
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Definition
midbrain, motor coordination |
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Term
the substantia nigra is located in the _______ and is important in reward, addiction and movement. It appears black because of high levels of melanin in neurons that release dopamine. |
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Definition
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Term
which group of nuclei scattered throughout the brainstem controls cyclic activities such as the sleep-wake cycle? |
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Definition
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Term
which portion of the diencephalon is responsible for integration of the nervous and endocrine systems? |
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Definition
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Term
true or false the midbrain originates from the rhomencephalon? |
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Definition
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Term
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Definition
receives information from the cerebrum and cerebellum, issues subconscious motor commands that affect upper limb position and background muscle tone. |
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Term
the term higher brain centers refers to those areas of the brain involved in higher-order functions. These centers would probably include nuclei centers and cortical areas of: |
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Definition
the cerebrum, diencephalon and cerebellum |
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Term
where is the site of cerebrospinal fluid production? |
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Definition
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Term
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Definition
tracts that link the cerebellum with the brain stem. |
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Term
the dural fold that divides the two cerebellar hemispheres is the: |
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Definition
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Term
the cerebrospinal fluid is produced and secreted by: |
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Definition
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Term
the primary purpose of the blood-brain barrier is to: |
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Definition
isolate neural tissue in the CNS from the general circulation |
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Term
the centers in the pons that modify the activity of the respiratory rhythmical centers in the medulla oblongata are the: |
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Definition
apneustic and pneumotaxic centers |
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Term
the nucleus gracilis in the medulla oblongata helps relay information for the _______ touch sense and the nucleus cuneatus relays information for the _____ touch sense. |
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Definition
lower body, upper body (except face) |
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Term
the final relay point for ascending sensory information that will be projected to the primary sensory cortex is the: |
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Definition
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Term
the establishment of emotional states is a function of the: |
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Definition
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Term
coordination of learned movement patterns at the subconscious level is performed by the |
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Definition
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Term
what are the 3 important functions of CSF? |
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Definition
1. cushioning delicate neural structures 2. supporting the brain 3. transporting nutrients, chemical messengers and waste products |
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Term
Which 3 areas of the brain are not isolated from general circulation by the blood brain barrier? |
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Definition
1. portions of the hypothalamus where the capillary endothelium is extremely permeable 2. capillaries in the pineal gland 3. capillaries in the choroid plexus |
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Term
name the 12 cranial nerves in order: |
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Definition
olfactory, optic, oculomotor, trochlear, trigeminal, abducent, facial, vestibulocochlear, glossopharyngeal, vagus, accessory, hypoglossal |
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Term
briefly summarize the overall function of the cerebellum |
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Definition
the cerebellum adjusts voluntary and involuntary motor activities based on sensory information and stored memories of previous experiences. |
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Term
the only cranial nerves that are attached to the cerebrum are the |
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Definition
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Term
If symptoms characteristic of Parkinson disease appear, which part of the mesencephalon is inhibited from secreting a neurotransmitter? Which neurotransmitter is it? |
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Definition
In Parkinson disease, the substantia nigra is inhibited from secreting the neurotransmitter, dopamine, at the basal nuclei. |
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Term
Stimulation of which part of the brain would produce sensations of hunger and thirst? |
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Definition
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Term
the _______ is shaped like a sea horse and appears to be important in the storage and retrieval of long term memories. Which functional system of the brain is this located? |
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Definition
hippocampus, which is part of the limbic system |
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Term
what varied roles does the hypothalamus play in the body? |
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Definition
1. subconscious control of skeletal muscle contractions 2. control of autonomic functions 3. coordination of nervous and endocrine systems 4. secretion of hormones 5. production of emotions and drives 6. coordination of autonomic and voluntary functions 7. regulation of body temp 8. control of circadian rhythms |
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Term
the limbic system or motivational system includes the |
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Definition
amygdaloid body, cingulate gyrus, dentate gyrups, parahippocampal gyrus, hippocampus and fornix. The functions of the limbic system involve emotional states and related behavioral drives. |
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Term
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Definition
masses of gray matter that lie within each hemisphere deep to the floor of the lateral ventricle. |
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Term
the basal nuclei are involved with: |
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Definition
subconscious control of skeletal muscle tone and the coordination of learned movement patterns. provide general pattern for rhythm. |
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Term
mesencephalon, the pons and the medulla oblongata comprise the: |
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Definition
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|
Term
why can damage to the medulla oblongata cause death? |
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Definition
it contains cardiac, vasomotor, and respiratory centers |
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Term
which nuclei in the medulla oblongata are responsible for relaying somatic sensory information to the thalamus? |
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Definition
nucleus gracilis and nucleus cuneatus |
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Term
sensory fibers have cell bodies in the: |
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Definition
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|
Term
motor fibers travel in the: |
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Definition
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Term
what are dermatomes and what are some important ones? |
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Definition
an area of skin that is mainly supplied by a single spinal nerve. some important ones: # C2 - posterior half of the skull cap # C3 - area correlating to a high turtle neck shirt #lumbar nerves sense information from the front of the legs --dermatomes allow you to pinpoint nerve damage. |
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Term
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Definition
innervates superficial neck structures, skin of neck, posterior portion of head. ansa cervicalis: loop between C1-C3 -phrenic nerve --from C3-C5 (cervical and brachial plexuses innervates diaphragm) |
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Term
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Definition
the brachial plexus... 5 ventral rami form 3 trunks that separate into 6 divisions then form cords that give rise to these branches/nerves: -axillary -radial -musculocutaneous -ulnar -median |
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Term
The plexus at L1-L4 and the plexus at L4-S5 constitute the: |
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Definition
lumbar plexus and sacral plexus or lumbosacral plexus -four major nerves exit and enter lower limb --obturator --femoral --tibial --common fibular (peroneal) |
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Term
____ are responsible for vision at low light levels. ____ are responsible for vision when light is brighter. |
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Definition
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Term
what is unique about the fovea and cone/rod distribution? |
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Definition
it is rod free with a high density of cones |
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Term
which photoreceptor cells are inhibited by light? |
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Definition
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Term
this type of photoreceptor does not discriminate among colors of light, and allows us to see in dimly lit rooms. |
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Definition
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Term
the frequency of a perceived sound is determined by: |
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Definition
which part of the cochlear duct is stimulated. |
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Term
the intensity (volume) of a perceived sound is determined by: |
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Definition
how many of the hair cells at the location are stimulated. |
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Term
what is unique about the sense of smell when compared to other senses? |
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Definition
olfactory stimulation is the only type of sensory information that reaches the cerebral cortex directly. |
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Term
how is olfactory information relayed to the brain? |
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Definition
reaches cerebral cortex directly, then a parallel distribution to the limbic system and hypothalamus help explain the profound emotional and behavioral responses, as well as the memories that can be triggered by certain smells. |
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|
Term
the olfactory epithelium contains what types of cells? |
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Definition
olfactory receptor cells, supporting cells, and regenerative basal cells (stem cells). |
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Term
What is olfactory adaptation? |
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Definition
when you quickly lose the ability to smell something by fatigue. |
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|
Term
how do we distinguish between different smells? |
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Definition
the CNS interprets each smell on the basis of the overall pattern of receptor activity. |
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Term
the blind spot occurs in the retina where: |
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Definition
the optic nerve attaches to the retina |
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Term
sound waves are converted into mechanical movements by the: |
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Definition
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Term
the basic receptors in the inner ear are the: |
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Definition
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Term
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Definition
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Term
at sunset, your vision reverts to _____ based vision. |
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Definition
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Term
the malleus, incus, and stapes are the tiny bones located in the: |
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Definition
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Term
receptors in the saccule and utricle provide sensations of: |
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Definition
gravity and linear acceleration |
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Term
the organ of corti is located in the _______ of the inner ear. |
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Definition
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Term
trace the olfactory pathway from the time an odor reaches the olfactory epithelium until nerve impulses reach their final destination in the brain: |
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Definition
axons leaving the olfactory epithelium collect into 20 or more bundles that penetrate the cribiform plate of the ethmoid to reach the olfactory bulbs of the cerebrum. Axons leaving the olfactory bulb travel along the olfactory tract to reach the olfactory cortex, hypothalamus, and portions of the limbic system. |
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Term
when viewing an object close to you, your lens should be more ________. |
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Definition
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Term
damage to the capula of the lateral semicircular duct would interfere with the perception of: |
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Definition
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Term
when viewing an object close to you, your lens should be more: |
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Definition
|
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