What occurs during the repolarization of a nerve fiber?

  • A
    $Na^+$ channels open and $K^+$ channels close.
  • B
    $Na^+$ channels close and $K^+$ channels open.
  • C
    Both ion channels remain open.
  • D
    Both $Na^+$ and $K^+$ channels close.

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Conduction of an impulse along the axon is associated with the

On application of a stimulus on the axonal membrane,

Assertion $(A)$: The axonal membrane of the neuron is more permeable to sodium ion $(Na^+)$ and nearly impermeable to potassium $(K^+)$.
Reason $(R)$: In a resting state,a neuron does not conduct any impulse.

For the propagation of a nerve impulse along a nerve fiber,what is the sequence of change in the electrical potential difference across the axolemma?

Nerve impulse initiates with the movements of

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