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| cells that are uniquely suited to perform a particular function |
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| glands and tissues that cover interior and exterior body surfaces |
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| tissue that provides support for the body |
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| tissue that transmits nerve impulses throughout the body |
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| tissue that enables the body to move |
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| the process by which organisms keep internal conditions relatively constant despite changes in external environments |
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| process in which a stimulus produces a response that opposes the original stimulus |
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| cells that transmit electrical impulses |
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| the largest part of a neuron |
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| branched extensions spreading out from the cell body of neurons |
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| the long fibers that carry impulses away from the cell body |
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| an insulating membrane that surrounds some axons that helps impulses jump to each node |
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| the electrical charge across thecell membrane of a neuron in its resting state |
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| a nerve impulse, or a reversal of charges from negative to positive along an axon |
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| the minimum level of a stimulus that is required to activate a neuron |
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| the location at which a neuron can transfer an impulse to another cell |
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| chemicals used by a neuron to transmit an impulse across a synapse to another cell |
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| three layers of connective tissues that wrap the brain and spinal chord |
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Definition
| a fluid that bathes the brain and spinal chord |
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| the largest and most prominent region of the humnan brain that is responsible for voluntary activities - left brain controls right side (opposite) two layers |
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| the second largest region of the brain at the back of the skull that coordinates actions |
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| connects brain and spinal chord |
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| receives messages from all ssensory receptors through thte body and relays to the proper cerebrum |
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| control center fro recognition and analysis of hunger, thirst and temperature |
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| a quick automatic response to a stimulus |
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| peripheral nervous system transmits impulses from sense organs to the CNS |
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| transmits impulses from the CNS to the muscles and glands |
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| regulates activities that are concious |
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| a sensory receptor that gets used and an impulse goes tot he spinal chord and back (too far to go to brain) |
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Definition
| system that regulates involuntary things two parts sympathetic and parasympathic systems |
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| sympathetic nervous system |
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Definition
| increases things Has opposite affect of parasympathetic |
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| parasympathetic nervous system |
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| decreases things has opposite affets to sympathetic |
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| peripheral nervous system |
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Definition
| system that can be divided into two parts - sensory and motor - all the nerves that are not part of the brain and spinal chord |
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| neurons that react to a specific stimulus such as light or sound by sending impulses to other neurons that eventually go to CNS |
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| receptors that are located everyone in the body except the brain |
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| receptors that detects variations in temperature |
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| receptors that are sensitive to touch pressure muscles sound and motion |
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| receptors located in the nose and taste buds - sensitive to chemicals |
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| receptors in the eyes - sensitive to light |
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| a small opening in the iris |
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| the colored part of the eye |
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| the fluid chamber of the eye |
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| helps focus light in the eye - where light enters |
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| behind the iris, helps focus things |
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| where hte lens focuses light onto - carries impulses to CNS |
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| 1 type of photoreceptors in the eye, does not see colors |
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| 1 tyepe of photoreceptor in the eye - sees colors |
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| a structure that creates pressure waves in the cochlea |
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| a structure in the ears that helps you maintain your balance |
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| a structure in your ear that gets vibrations that become nerve impulses to your brain |
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| structure that causes vibrations on the outside of the inner ear |
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| sense organs that detect taste |
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| any substance other than food that changes the function of the body |
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| drugs that increase the actions regulated by the nervous system |
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| drugs thatdecrease the rate of functions of the brain |
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| a stimulant that releases dopamine |
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| a drug that relases endorphins to overcome pain |
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| a depressent which is the number one most abused legal drug - slows CNS |
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| a group of birth defects caused by alcohol on the fetus |
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| any intentional misuse of any drug for nonmedical purposes |
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| an uncontrollable dependence on a drug |
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