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Ch. 7 Nervous System
| Term | Definition |
|---|---|
| stimulus | a change or signal in the environment that makes you react |
| response | your body's reaction to a stimulus |
| nerve impulse | the message a neuron carries |
| neuron | nerve cell |
| axon | the part of the neuron that carries the impulse away from the cell body |
| nerve | a bundle of nerve fibers |
| dendrite | picks up the nerve impulse and sends it to the cell body |
| sensory neuron | a neuron that picks up a stimulus |
| interneuron | a neuron that carries and impulse to another neuron |
| motor neuron | a neuron that sends an impulse to a muscle or gland |
| synapse | the place where a neuron transfers and impulse to ANOTHER neuron |
| Central Nervous System | the brain and spinal cord |
| Peripheral Nervous System | the nerves in your body are part of this |
| Brain | the control center of your body |
| Spinal Cord | a column of nerve tissue that links the brain to the peripheral nervous system |
| Cerebrum | the part of your brain in charge of memory |
| Cerebellum | the part of your brain in charge of balance |
| Brain Stem (Medulla) | the part of your brain in charge of involuntary actions like breathing and heart beat |
| Somatic Nervous System | controls voluntary actions |
| Autonomic Nervous System | controls involuntary actions |
| Reflex | an automatic response |
| Concussion | a brain injury |
| Pupil | the opening where light enters the eye |
| Retina | lines the back of the eye |
| Lens | focuses light in the eye |
| Iris | the colored part of the eye |
| Optic Nerve | allows the eye to send messages to the brain |
| Hammer, Anvil, Stirrup | bones in the ear |
| Taste Buds | sensory receptors on your tongue |