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Across 1. chemical messengers 4. recieves messages from other cells 9. a set of glands that secret hormones into the bloodstream 10. a simple, automatic, inborn response to a sensory stimulus 14. neurons that carry incoming information from the sense receptors to the CNS 20. interconnected neural cells 22. the body's speedy, electrochemical comunication network 23. this passes messages away from the cell body 24. the cell's life support center 25. the level of stimulation requred to trigger a neural impulse

Down 2. chemical messangers 3. regulates growth 5. this nervous system arouses 6. a brief electrical charge that travels down the axon 7. helps speed neural impulses 8. neural "cables" containing many axons 11. this nervous system conserves energy as it calms 12. secretes epinephrine and norepinephrine 13. a neurotransmitter that enables learning and memory 15. natural, opiatelike neurotransmitters linked to pain control and to pleasure 16. CNS neurons 17. neurons that carry outgoing information from the CNS to the muscles and glands 18. this nervous system controls the glands and the muscles of our internal organs 19. this nervous system enables voluntary control of our skeletal muscles 21. basic building block of the nervous system