CNS & PNS Histology & Physiology - BM5 NLM1

1. True or false: inhibitory post-synaptic potentials can undergo both spatial & temporal summation?

  • True
  • I'm sorry I haven't a clue
  • False
  • Pass
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Other questions in this quiz

2. At resting membrane potential, which of the following is most likely to be true?

  • There is a high [K+] inside the neuron and a high [Na+] outside the neuron, but the resting neuronal membrane is less permeable to K+ than Na+
  • There is a high [K+] inside the neuron and a low [Na+] outside the neuron, but the resting neuronal membrane is less permeable to K+ than Na+
  • There is a high [K+] inside the neuron and a high [Na+] outside the neuron, but the resting neuronal membrane is more permeable to K+ than Na+
  • There is a high [K+] inside the neuron and a low [Na+] outside the neuron, but the resting neuronal membrane is more permeable to K+ than Na+

3. Which of the following is a disadvantage of oligodendrocytes?

  • The Na+/K+ pump is only found at nodes of Ranvier
  • Oligodendrocytes are too metabolically efficient
  • A disease process that affects one oligodendrocyte will affect up to 50 axons, meaning the consequences on the CNS can be huge
  • The conduction velocity can be ~10x faster

4. How do astrocytes maintain local homeostasis?

  • Take up K+ from the extracellular space, convert glutamate to glutamine, protect neurons from low [NH4], and allow flow of all liquids across the BBB
  • Take up K+ from the extracellular space, convert glutamate to glutamine, make sure neurons have a high [NH4], and maintain the BBB
  • Take up K+ from the extracellular space, convert glutamate to glutamine, protect neurons from high [NH4], and maintain the BBB
  • Take up Na+ from the extracellular space, convert glutamine to glutamate, protect neurons from high [NH4], and maintain the BBB

5. What is temporal summation?

  • Summation of excitatory post-synaptic potentials generated at the same synapse immediately
  • Summation of excitatory post-synaptic potentials generated at multiple synapses immediately
  • Summation of excitatory post-synaptic potentials generated at the same synapse within rapid succession
  • Summation of excitatory post-synaptic potentials generated at multiple synapses within rapid succession

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