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Across 1. specialized sensory cells triggered by specific types of stimuli; convert a stimulus into a nerve impulse 5. type of neuron that picks up stimuli and converts them into a nerve impulse 7. message carried by a neuron in the form of an electro-chemical signal 10. serotonin, dopamine and epinephrine are examples. 11. automatic response that occurs rapidly and without conscious control 12. threadlike extension of a neuron that carries nerve impulses toward the cell body 13. any change or signal in the internal or external environment that can cause an organism to react 15. chemicals that "ferry" the impulse across the synapse are released here (2 words) 16. junction where one neuron can transfer an impulse to the next structure 18. neuron that sends an impulse to a muscle or gland that causes a reaction

Down 2. muscles/glands that deliver the response to a stimulus 3. a bundle of nerve fibers 4. what the body does in reaction to a stimulus 6. maintaining this dynamic process on which life depends is one of the nervous system's functions 8. found in CNS; carries nerve impulses from one neuron to another 9. central part of neuron containing the nucleus and linking dendrites and axon 14. smallest functional unit of the nervous system; carries information in the form of an electro-chemical impulse 17. threadlike extension of a neuron that carries nerve impulses away from the cell body