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| any change or signal in the environment that an organism can recognize and react to |
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| the message a neuron carries |
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| a branchlike structure that picks up the impulses |
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| a long structure leading away from a body cell |
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| picks up a stimulus and converts it into a nerve impulse |
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| carries a nerve impulse to another interneuron or a motor neuron |
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| sends an impulse to a muscle or glad, enabling it to respond |
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| the place where a neuron transfers an impulse to another structure |
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| includes the brain and the spinal cord |
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| peripheral nervous system |
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| includes all the nerves outside of the CNS |
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| the control center of the body |
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| a thick column of nervous tissue that links the brain to the peripheral nervous system |
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| controls your body's involuntary reactions |
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| interprets input from your senses, controls movement, and carries out complex mental processes. |
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| coordinates your muscle actions and helps you keep your balance |
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| controls voluntary actions |
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| controls involuntary actions |
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| an automatic response that occurs rapidly without conscious control |
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| occurs when the soft tissue of the brain is bruised as it collides against the skull |
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| the clear tissue that covers the front of the eye |
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| the opening through which light enters the eye |
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| a circular structure that surrounds the pupil and regulates how much light enters the eye |
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| a flexible structure that focuses light |
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| lines the back of the eye |
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| occurs when people see nearby objects clearly but not distant objects |
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| occurs when people see distant objects clearly but not nearby objects |
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| a membrane that vibrates when sound waves strike it |
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| a snail shaped tube lined with sound receptor cells |
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| help your central nervous system maintain balance |
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| sensory receptors on your tongue |
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| any chemical taken into the body that causes changes in a person's behavior |
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| the deliberate use of a drug for nonmedical purposes or the use of an illegal drug |
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| a state in which a drug user needs more of a drug to produce the same effect on the body |
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| the body becomes physically dependent on a drug |
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| an adjustment period that occurs when a person stops taking a drug on which the body is dependent |
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| drugs that slow down the activity of the central nervous system |
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| drugs that speed up body processes |
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| synthetic chemicals that are similar to some hormones naturally produced in the body |
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| a disease in which a person is physically addicted to and emotionally dependent upon alcohol |
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