Practice MCQ's 108

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1. During and action potential, the change in membrane potential associated with the influx of sodium ions triggers the

  • Opening of potassium channels
  • Opening of chloride channels
  • Closing of chloride channels
  • Closing of potassium channels
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2. A neuron fires when:

  • There is an EPSP
  • There is an IPSP
  • The degree of depolarisation of the axon hillock exceeds the threshold of activation
  • Its sodium-potassium pumps are stimulated

3. Telencephalon refers to the:

  • Head
  • Brain stem
  • Cerebral hemispheres
  • Cortex

4. The two major divisions of the nervous system are the:

  • ANS and the PNS
  • ANS and the CNS
  • PNS and the CNS
  • SNS and the CNS

5. Communications amongst mammalian neurons usually occur:

  • Across dendrites
  • At points where their axons contact one another
  • Across synapses
  • At points where their cell bodies contact one another
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