Which one of the following can cause the interior of the neuron to have a momentary positive charge?

(a) Opening of potassium leak channels

(b) Activity of the Na/K ATPase

(c) Opening of voltage gated sodium channels

(d) Opening of voltage gated potassium channels

(c) Opening of voltage gated sodium channels

Explanation:

The firing of action potential leads to a quick opening of voltage-gated Na + channels and slow opening of K + channels. The opened voltage-gated Na + channels allow the Na + to enter the neuron and cause depolarization.

The interior of the cell becomes positive quickly. As the rising potential passes 0 mV, the voltage-gated Na + channels are inactivated and the entry of the Na + stops while the K + channels are fully opened to repolarize the membrane again.