Across
- 5. an automatic response that occurs very rapidly and without conscious control
- 6. a threadlike extension of a neuron that carries nerve impulses toward the cell body
- 9. neuron a neuron that picks up stimuli from the internal or external environment and converts each stimulus into a nerve impulse
- 10. a neuron that carries nerve impulses from one neuron to another
- 12. the part of the brain that coordinates the actions of the muscles and helps maintain balance
- 13. neuron a neuron that sends an impulse to a muscle, causing the muscle to contract
- 14. cord the thick column of nerve tissue that is enclosed by the vertebrae and that links the brain to most of the nerves in the peripheral nervous system
- 15. the part of the central nervous system that is located in the skull and that controls most functions in the body
Down
- 1. the part of the brain that interprets input from senses, controls the movement of skeletal muscles, and carries out complex mental processes
- 2. nervous system all nerves located outside the central nervous system; connects the central nervous system to all parts of the body
- 3. a threadlike extension of a neuron that carries nerve impulses away from the cell body
- 4. impulse a message carried by a neuron
- 7. the tiny space between the tip of an axon and the next structure
- 8. the part of the brain that controls many body functions that occur automatically
- 11. a cell that carries messages through the nervous system
- 12. nervous system the brain and the spinal cord; the control center of the body