The Nervous System

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Across
  1. 4. Transmitter that activates 2nd messenger system
  2. 5. The synaptic input of many neurons to one
  3. 7. The membrane channel that maintains the concentration gradients
  4. 10. Division of the ANS that maintains resting functions of the internal organs
  5. 12. The conversion of stimulus energy to a neuronal signal
  6. 17. Touch receptor
  7. 19. ____ junctions that allow a direct electrical connection between two cells
  8. 20. What do we call brain cells
  9. 23. Organized array of surface of receptor cells on the sensory surface
  10. 24. The synaptic output of one neuron onto many
  11. 26. The ____ summation from the additive effects of PSPs occurring close together in time
  12. 28. Lobe that contains the primary visual cortex
  13. 29. How ions move across the cell membrane
  14. 31. Photoreceptors: rod and ____
  15. 32. A ____ refractory period occurs after the absolute refractory period
  16. 35. ____ potentials are local changes in the membrane potential that decay over a short distance
  17. 36. Division of the ANS that regulates the functions of the gut
  18. 37. Depolarization occurs via a _____ feedback loop
  19. 39. Nervous system is split into central and ______
  20. 40. Name of the ion that moves into a cell
  21. 42. The location of the hair cell auditory receptors
  22. 43. Long portion of the cell that a membrane potential will travel down
  23. 44. Removal of a transmitter by enzymatic breakdown
  24. 45. Name of the special fluid that the brain floats in
  25. 47. Nervous system fibers that innervate smooth muscle, cardiac muscle, and glands
  26. 48. Temperature receptor
Down
  1. 1. A change in membrane potential to become more negative
  2. 2. Channel that allows ion to flow down its electrochemical gradient
  3. 3. Part of the brain that regulates many homeostatic functions
  4. 6. Some synapses excite, whereas others ___
  5. 8. Part of the brain that plays a particularly important role in balance and control of motor coordination
  6. 9. Nodes of ____, aka gaps in myelin insulation
  7. 11. The state the sodium voltage-gated channel can exist in that the potassium channel cannot
  8. 13. Division of the ANS that prepares for strenuous physical activity
  9. 14. Resting membrane ______
  10. 15. Lobe that contains the somatosensory cortex
  11. 16. _____ has a higher cell membrane permeability then sodium
  12. 18. Junction between two neurons or between a neuron and a muscle/gland that enables cells to influence one another electrically or biochemically
  13. 21. Carries the signal across a synapse by binding to postsynaptic receptors
  14. 22. _____ potential is an all or nothing reversal in membrane potential
  15. 25. Nervous system fibers of the motor neurons that supply the skeletal muscles
  16. 27. multilayered sheath of plasma membrane that acts as an insulator to the flow of a current through the axon
  17. 30. Pain receptor
  18. 31. What ion enters the presynaptic cell after the action potential propagates
  19. 33. The brain stem consists of the midbrain, pons, and _____
  20. 34. The ____ summation from the additive effect of PSPs occurring together on nearby parts of the same cell
  21. 38. Lobe that contains the primary motor cortex
  22. 41. A change in membrane potential to become more positive
  23. 46. Lobe that contains the primary auditory cortex