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Question

The figure below shows events of nerve impulse conduction. Select the option giving correct identification together what it represents?


A
Figure [A] – Site (a) is showing repolarisation
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B
Figure [B] – Site (c) is showing hyper polarisation
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C
Figure [A] & [B] – Site (a) is showing depolarization
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D
Figure [B] – Site (a) is in refractory period
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Solution

The correct option is D Figure [B] – Site (a) is in refractory period
Nerve impulses begin in a dendrite, move toward the cell body, and then move down the axon. A nerve impulse travels along the neuron in the form of electrical and chemical signals.

The following four steps describe the initiation of an impulse to the “resetting” of a neuron to prepare for a second stimulation:
  • Action potential
  • Repolarization
  • Hyperpolarization
  • Refractory period
Site (a) is in refractory period

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