Term
chemoreceptors
photoreceptors |
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Definition
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thermoreceptors
Mechanoreceptors |
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Definition
temperature
deformation of a cell membrane |
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Term
nociceptors
proprioceptors |
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Definition
pain adverse stimuli
position of limbs in space |
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Definition
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Definition
fire at a continuous rate as long as unchanging stimulus is applied
(holding your arm out) |
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Definition
fire at a decreasing rate as long as an unchanging stimulus applied
(being unaware that your clothes are touching you) |
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Term
| Law of specific nerve energies |
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Definition
-each sensory neuron responds to its normal stimulus
-the stimulus they are designed for they are most sensitive to
-it takes little of the stimuli to get them to go |
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Term
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Definition
generator potentials
depolarizations triggered by an environmental stimulus
is the stimuli is strong enough, depolarization will reach threshold and an action potential will be triggered. |
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Definition
| area in which a stimulus will trigger a receptor |
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Term
receptive fields
density vs size |
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Definition
density of fields is inversely proportional to the size, the bigger the area the less sensitive
the smaller the fields the more receptors in a given area |
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Term
| two point touch threshold |
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Definition
indicator of tactile acuity
minimum distance that 2 points of tough on the skin are still perceived as two |
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Term
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Definition
using interneurons, sensory neurons most stimulated will inhibit surrounding sensory neurons
a method to increase sensitivity and discrimination in the CNS |
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Definition
| chemoreceptors detect chemicals, best detected if there is spit so the chemicals can dissolve. |
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Term
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Definition
gustatory cells
composed of specialized epithelial cells than can depolarize and release transmitter |
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Term
| taste sensation cranial nerves |
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Definition
facial-anterior 2/3 of tongue
glossopharyngeal-posterior 1/3 of tongue |
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Term
| Sweet Umami and Bitter tastes |
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Definition
large molecules
can't enter the cell they bind to a membrane receptor these cause G proteins to disassociate, they use second messengers. |
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Term
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Definition
| H and Na ions enter the cell-causes depolarization opens Ca channels Ca goes in NT released causes gust here to stimulated |
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Definition
Umami-chicken/association taste buds
Water... Don't forget water! |
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receptors composed of dendritic ends of millions of bipolar cells
smell doesn't go to the thalamus |
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Term
| property of smell receptors |
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Definition
have the ability to replace themselves
also G-protien coupled (many Gs per receptors)
also use 2nd messenger system |
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Term
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Definition
located on roof of nasal cavity
olfactory neurons pass through the cribiform plate
project directly to cortex of olfactory bulb
info projected to medial temporal lobe, and portions of limbic system |
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