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Across 1. cells that support, nurture, and insulateneurons 4. A hormone, secreted by the pineal gland, that is involved in regulation of daily biological rhythms 5. hermones that regulate the development and functioning of reproductive organsand that stimulate the development of male and female sexual characteristics 8. hormones that are produced by the adrenal glands and that are involved in emotion and stress 9. the part of the neuron that keeps it alive and and determines whether it will fire 10. the brain's the brains ability to change and adapt in response to experience 11. internal organs that produce hormones and release them into the bloodstream 13. A neuron's extending fiber that conducts impulses away from the cell body and transmits them to other neurons or to muscle or gland cells 14. chemical substances in the nervous system that are similar structure and action to opiates 15. immature cells that renew themselves and have the potential to develope into mature cells 16. A neuron's branches that receive information from other neurons and transmit it toward the cell body 17. A fatty insulation that may surround the axon of a neuron 18. A cell that conducts electrochemical signals; the basic unit of the nervous systesbility to changem 19. A bundle of nerve fibers (axons and sometimes dendrites) in the peripheral nervous system

Down 2. A brief change in electrical voltage that occurs when a neuron is stimulated 3. the site where thransmission of a nerve impulse from one nerve cell to another occurs 6. A chemical substance that is released by a transmitting neuron at the synapse and that alters the activity of a receiving neuron 7. chemical substances, secreted by organs called glands, that affect the functionaling of other organs 12. A hormone,secreted by the pituitary gland, that stimulates uterine contractions during childbirth, facilititates the ejection of milk during nursing,and seems to promote, in both sexes, attachment and trust in relationships