These processes occurs during repolarization of nerve fibre
(i) Open `Na^(+)`channel (ii) Closed `Na^(+)` channel
(iii) Closed `K^(+)` channel (iv) Open `K^(+)` channel

Options

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

Answer

A

Explanation

During repolarization phase `Na^(+)` channels inactivated and `K^(+)` channels open. Once the cell reaches its peak positive potential, it repolarizes returning to a negative membrane potential.