9-12 pt 1

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Across
  1. 3. the bodys "slow" chemical communication system; a set of glands that secrete hormones into the bloodstream
  2. 4. neurons within the brain and spinal cord; they communicate internally and process information between the sensory inputs and motor outputs
  3. 6. the neuron extension that passes messages through its branches to other neurons or to muscles and glands
  4. 8. bundled axons that form neural cables connection the central nervous system with muscles, glands and sense organs
  5. 10. a neurotransmitters reabsorption by the sending neuron
  6. 14. the endocrine system's most influential gland. Under the influence of the hypothalamus the pituitary regulates growth and controls other endocrine glands
  7. 15. the part of the peripheral nervous system that controls the glands and the muscles of the internal organs.
  8. 17. a molecule that increases a neurotransmitter's action
  9. 19. neurons, neurons that carry outgoing information from the brain and spinal cord to the muscles and glands.
  10. 21. the division of the nervous system that arouses the body, mobilizing its energy.
  11. 22. the junction between the axon tip of the sending neuron and the dendrite of the cell body of the receiving neuron. The tiny gap at this junction is called the synaptic gap
  12. 26. the division of the peripheral nervous system that controls the body's skeletal muscles.
  13. 27. a neural impulse; a brief electrical charge that travels down the axon
Down
  1. 1. the division of the autonomic nervous system that calms the body, conserving its energy.
  2. 2. the part of a neuron that contains the nucleus; the cell's life-support center
  3. 5. a simple, automatic response to a sensory stimulus, such as a knee jerk response
  4. 7. chemical messengers that cross the synaptic gaps between neurons. When released by the sending neuron, neurotransmitters travel across the synapse and bind to the receptor sites on the receiving neuron, thereby influencing whether that neuron will generate a neural impulse.
  5. 9. opiate-like neurotransmitters linked to pain control and to pleasure
  6. 11. chemical messengers that are manufactured by the endocrine glands, travel through the bloodstream and affect other tissues
  7. 12. 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
  8. 13. a pair of endocrine glands that sit just above the kidneys and secrete hormones that help arouse the body in times of stress
  9. 15. a molecule that inhibits or blocks a neurotransmitter's action
  10. 16. in neural processing, a brief resting pause that occurs after a neuron has fired; subsequent action potentials cannot occur until the axon returns to its resting state
  11. 18. the body's speedy, electrochemical communication network, consisting of all the nerve cells of the peripheral and central nervous system
  12. 20. neurons that carry incoming information from the body's tissues and sensory receptors to the brain and spinal cord.
  13. 23. cells in the nervous system that support, nourish, and protect neurons; they also play a role in learning, thinking, and memory
  14. 24. the level of stimulation required to trigger a neural impulse
  15. 25. a neuron's often bushy, branching extensions that receive and integrate messages conducting impulses toward the cell body