Across
- 3. the division of the PNS that controls the body’s glands and muscles of the internal organs
- 4. the neurons that carry incoming information from the sensory receptors to the brain and spinal cord
- 7. (2 words) the body’s slow chemical communication system; set of glands that secrete hormones into the bloodstream
- 10. (3 words) the sensory and motor neurons that connect the central nervous system to the rest of the body
- 14. the division of the autonomic nervous system that arouses the body, mobilizing its energy in stressful situations.
- 15. (2 words) cells in the nervous system that support, nourish, and protect neurons
- 17. the level of stimulation required to trigger a neural impulse
- 19. the neurons that carry outgoing information from the brain and the spinal cord to the muscles and glands
- 20. the neurons within the brain and spinal cord that communicate internally and intervene between the sensory inputs and motor outputs
- 21. the space between the dendrites of one neuron and the axons of another
Down
- 1. (3 words) the brain and spinal cord
- 2. the division of the autonomic nervous system that calms the body, conserving energy
- 5. (2 words) a neural impulse; an electrical charge that travels down an axon
- 6. (2 words) the gland that influences the hypothalamus and regulates growth and control of the other endocrine glands
- 8. (2 words) a fatty tissue layer segmentally encasing the axons of some neurons; enables vastly greater transmission speed as neural impulses hop from one node to the next
- 9. chemical messengers that travel through the bloodstream and affect other tissues
- 11. (2 words) a pair of endocrine glands that sit above the kidneys and secrete hormones that help arouse the body in time of stress
- 12. a nerve cell; the basic building block of the nervous system
- 13. the division of the PNS that controls the body’s skeletal muscles
- 16. the neuron extension that passes messages through its branches to other neurons or to muscles or glands
- 18. a neuron’s bushy, branching extensions that receive messages and conduct impulses toward the cell body