CHAPTER 11: NEURONS

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Across
  1. 2. Bundles of neuron processes (axons) in the CENTRAL nervous system
  2. 3. The addition of signals depending on strength and frequency to total to surpass threshold
  3. 9. Nodes of Ranvier are found on ___________ axons
  4. 14. This neuron sends electrical signals AWAY from the synapse ("listens")
  5. 17. Axon cell membrane
  6. 18. This is the most common type of synapse
  7. 20. This segment of a neuron contains chemically-gated channels (Na+, K+, Cl-). Where dendrites are found on the neuron
  8. 22. Bundles of neuron processes (axons in the PERIPHERAL nervous system
  9. 24. Transports away from the neuron cell body
  10. 26. Clusters of neuron cell bodies in the CENTRAL nervous system
  11. 27. Transports toward the neuron cell body
  12. 29. These neuroglia cells help form the blood-brain barrier
  13. 31. This segment of a neuron is where the release of neurotransmitters takes place. Contains voltage-gated Ca2+ channels and the Ca+ pump
  14. 33. Causes inside of cell to become either more negative or less negative
  15. 35. Clusters of neuron cell bodies in the PERIPHERAL nervous system
  16. 36. These cells form the myelin sheath in the CENTRAL nervous system
  17. 37. Place where a neuron connects to another neuron or an effector
Down
  1. 1. These are phagocytic cells that move through the CNS
  2. 2. This type of summation occurs when the same neuron is firing rapidly
  3. 4. This type of summation occurs when rapid signals come from multiple terminals
  4. 5. Surrounds, protects and insulates the axon of neurons, helps conduct electrical impulses. Made of a white protein-lipid substance called myelin
  5. 6. Generates nerve impulses and transmits them along axolemma to axon terminal
  6. 7. This segment of a neuron transmits the action potential. It contains voltage-gated Na+ and K+ channels located on the axon itself
  7. 8. All-or-none nerve impulse
  8. 10. Receptive (input) regions of the neuron
  9. 11. These cells for the myelin sheath in the PERIPHERAL nervous system
  10. 12. Small cells that surround and wrap delicate neurons
  11. 13. This segment of a neuron contains voltage-gated Na+ and K+ channels found on or near the axon hillock
  12. 15. These cells surround neuron cell bodies in the PERIPHERAL nervous system
  13. 16. Most important ion when changing the resting membrane potential
  14. 19. Allows AP to be transmitted down entire axon towards the terminals
  15. 21. These neuroglia cells assist in the production and circulation of cerebrospinal fluid (CSF)
  16. 23. Causes depolarization; brings neuron closer to threshold ("Fire!")
  17. 25. This neuron sends electrical signals TOWARD the synapse ("talks")
  18. 28. Causes hyper-polarization; brings neuron further away from threshold ("don't fire!")
  19. 30. Excitable cells that transmit electrical signals
  20. 32. Rough ER of neurons
  21. 34. This synapse is less common than chemical synapses