Nervous System

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Across
  1. 4. The part of the autonomic nervous system that arouses the body to deal with perceived threats; fight or flight
  2. 9. 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
  3. 11. A neuron that has many/multiple extensions from the cell body
  4. 14. the part of the peripheral nervous system that controls the glands and the muscles of the internal organs (such as the heart). Also called the involuntary nervous system
  5. 15. central nervous system; brain and spinal cord
  6. 16. Individual cells in the nervous system that receive, integrate, and transmit information.
  7. 17. Largest part of a typical neuron; contains the nucleus and much of the cytoplasm
  8. 18. the part of the PNS that sends sensory input to the CNS from sensory receptors around the body
  9. 20. the junction between the axon of the sending neuron and the dendrite or cell body of the receiving neuron
  10. 22. Neuron that has a short, single projection from the cell body
Down
  1. 1. the part of the PNS that sends motor signals from the CNS to muscles or glands
  2. 2. A special transport protein in the plasma membrane of animal cells that transports sodium out of the cell and potassium into the cell against their concentration gradients to jumpstart a neuron's action potential
  3. 3. A neuron that has only two projections (one axon/one dendrite) from the cell body
  4. 5. Chemicals that transmit information from one neuron to another
  5. 6. A branch of the autonomic nervous system that maintains normal body functions; it calms the body ever conserves energy.
  6. 7. a neural impulse; a brief electrical charge that travels down an axon; allows sodium ions to move into the cell
  7. 8. Branchlike parts of a neuron that are specialized to receive information.
  8. 10. Division of the PNS that controls the body's skeletal muscles.
  9. 12. cells that support and protect neurons; called "nerve glue"
  10. 13. the sensory and motor neurons that connect the CNS to the rest of the body
  11. 19. fast-acting control system that uses nerve impulses to trigger muscle contraction or gland secretion; made up of brain, spinal cord, nerves
  12. 21. A threadlike extension of a neuron that carries nerve impulses away from the cell body.