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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$(1)$ In an excited nerve fibre region,a positive charge is created inside the plasma membrane.
$(2)$ In some animals,the conduction of nerve impulses is saltatory.

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Which of the following processes are responsible for the transport of $Na^+$ from outside to the inner side of the axon membrane during the generation of a nerve impulse?

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