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NeuronAL Structure & FXN

  1. Difference between Nerves & Neurons
    • Neuron is 1 cell
    • Nerve is a group of cells
  2. Name of neuron cell body
    Soma
  3. How many dendrites per axon
    Can be multipolar or unipolar
  4. Name the area of the nervous system where chemical signals are passed from one neuron to the next
    Synaptic cleft
  5. What part of the neuron recurved the chemical signal
    Dendrite
  6. What is resting membrane potential?
    -70mV
  7. What causes resting membrane potential
    • Na+/K+ ATPase
    • K+ Leak Channels
  8. What does the Na+/K+ filter do
    • Pumps out 3 Na+
    • Brings in 2 K+
    • Hydrolyzes 1 ATP to do this
  9. What does a K+ leak channel do
    Stays open & allows K+ owt
  10. What is an axn potential
    • Disturbance in membrane potential
    • Depolarization of plasma membrane
  11. What is threshold potential?
    -50mV
  12. What happens at threshold potential?
    Channels open fully
  13. When do channels close?
    When membrane potential reaches +35mV
  14. How does repolarization happen ?
    • Voltage gated Na+ channels deactivate
    • Voltage gated K+ channels open
  15. What is the membrane potential at hyperpolarization ?
    -90mV
  16. What is saltatory conduction ?
    Rapid jumping of conduction in myelinated axons
  17. Name the cells that create myelin in the PNS
    Schwann Cells
  18. Name the cells that create myelin in the CNS
    Oligodendrocytes
  19. What is equilibrium potential?
    Membrane potential at which there is no net movement of ions
  20. What is the difference between absolute refractory period and relative refractory period ?
    • In absolute refractory period there is no depolarization no matter how hard the signal
    • In relative refractory if there is a strong enough signal there will be depolarization
  21. Where will you see an electrical signal
    • Seen in cytoplasm of 2 cells connected by gap junction
    • In smooth and cardiac muscle
  22. Where does a chemical signal occur?
    At the end of axons
  23. Where is the neuromuscular jxn?
    Between neurons and skeletal muscle
  24. What is the enzyme that degrades acetylcholine left over in the synaptic cleft ?
    Acetylcholinesterase
  25. What is temporal summation ?
    When axn potential is fired so rapidly that excitatory postsynaptic potentials (EPSP) or inhibitory postsynaptic potentials (IPSP) pile on top of ea. Other
  26. What is spatial summation ?
    When IPSP & EPSP are taken at a given point in time
Author
JaneenR
ID
350056
Card Set
NeuronAL Structure & FXN
Description
Updated

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