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Name Class Date Chapter 31 Vocabulary Review For Questions 1–10, match the term with its description. 1. peripheral nervous system A. Short, branched extensions from the neuron’s cell body that carry impulses from other neurons to the cell body 2. myelin sheath 3. threshold B. Insulating membrane surrounding the axon of a neuron 4. dendrites 5. neurotransmitter C. Pathway travelled by impulses during a rapid response 6. somatic nervous system D. Regulates activities under conscious control 7. reflex arc 8. cochlea E. The minimum level of a stimulus that is required to cause an impulse in a neuron 9. cornea 10. reflex F. Nerves and supporting cells that collect information about the body’s environment G. Chemical that transmits an impulse across a synapse to another cell H. Tough, transparent layer of cells through which light enters the eye I. Fluid-filled inner ear structure lined with hair cells J. Quick, automatic response to a stimulus For Questions 11–20, complete each statement by writing the correct word or words. 11. The the cerebrum. receives messages from sensory receptors and relays information to 12. The division of the peripheral nervous system that regulates involuntary activities is the . 13. The is the site of intelligence, learning, and judgment in the brain. 14. The lens focuses light onto the 15. The oblongata. , the inner layer of the eye. has three regions, the midbrain, the , and the medulla 16. Photoreceptors that do not distinguish different colors are 17. The brain and the spinal cord make up the 18. The matter. . . is made up of densely packed nerve cell bodies called gray 19. Most addictive substances act on synapses that use 20. A nerve impulse, or another neuron or the environment. as a neurotransmitter. , begins when a neuron is stimulated by 496