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Question

Which of these processes occurs during repolarization of nerve fibre?
(i) Open Na+ channel
(ii) Closed Na+ channel
(iii) Closed K+ channel
(iv) Open K+ channel

A
(ii) and (iv)
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B
(i) and (iii)
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C
(ii) and (iii)
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D
(i) and (ii)
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Solution

The correct option is A (ii) and (iv)
Polarization events help in the conduction of nerve impulses between nerve cells. Depolarization and repolarization are the phases during nerve transmission.
  • In depolarization, the charge of the inner side of the membrane shifts from negative to positive by opening sodium influx and potassium ex-flux out of the cell.
  • Repolarization is the shift of charge of the inner side of the membrane from positive to negative by the closing movement of Na and K influx in the cell. So, the correct answer is option A.

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