Nervous System (Biology)

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Across
  1. 5. Are found in the brain and spinal cord; act as an integration centre
  2. 6. potential the change in charge that occurs when gates for Na+ open in a neuron
  3. 8. Muscles, glands, and other organs that respond to impulses from the motor neuron
  4. 9. return of a nerve to its resting potential (-70 mv) after depolarization due to Na+ gates closing and K+ gates opening
  5. 10. A neurotransmitter which simulates fight or flight activity
  6. 13. a chemical that travels across a synapse between neurons
  7. 15. cells nourish the neurons, remove their wastes, and defend against infection
  8. 17. period follows an action potential and is when a neuron cannot be stimulated.
  9. 18. The type of neurotransmitter in a cholinergic synapse
  10. 21. membrane that surrounds and protects CNS
  11. 22. neurons Conduct impulses from the interneurons to the effectors
  12. 23. nervous system part that we can consciously control
  13. 24. neuronsTransmit impulses from the sensory receptors to the interneurons
  14. 25. arc simple connection of neurons that results in a reflex action generated by the spinal cord in response to a stimulus
  15. 27. nervous system region that includes the brain and spinal cord
  16. 28. a cell type that forms the myelin sheath
  17. 29. fatty insulating layer around the axon of some nerve cells that speeds up signals
  18. 31. all nervous system regions EXCEPT the brain and spinal cord
Down
  1. 1. end of a neuron that receives signals from other neurons or sensory receptors
  2. 2. Tiny gap between a neuron end and a dendrite on another nerve or an effector cell
  3. 3. name of the nodes or spaces between pieces of myelin
  4. 4. stage where the membrane potential goes from −70 mV to +35 mV by Na+ gates open and close
  5. 7. receptors Receive stimuli and form a nerve impulse
  6. 11. nerve cell the structural and functional unit of the nervous system
  7. 12. many thin extensions of cytoplasm that receive impulse from other nerves
  8. 14. transmits impulses away from the dendrites
  9. 16. A neurotransmitter which stimulates parasympathetic activity
  10. 17. Detects stimulus and converts to electrical energy
  11. 19. nervous system part that lacks conscious control
  12. 20. Consists of nerves and ganglia on the outside of the CNS
  13. 26. Receives electrical impulse from CNS and creates response
  14. 30. message pathway of the nervous system that is made up of many neurons