Question

During the phase of depolarisation of nerve impulse, ______.

Options

• Na⁺ gates open and K⁺ gates close.

• K⁺ gates open and Na⁺ gates close.

• Na⁺ and K⁺ gates ard are closed.

• Na⁺ and K⁺ gates are open.

Answer 1

During the phase of depolarisation of nerve impulse, Na⁺ gates open and K⁺ gates close.

Explanation:

During depolarisation, voltage-gated sodium (\(Na^{+}\)) channels open rapidly, allowing an influx of sodium ions into the neuron. At the same time, potassium (\(K^{+}\)) channels remain closed, leading to a reversal of the membrane potential from negative to positive.