Question

at resting membrane potential, which of the following statements about the voltage - gated sodium ion channels is true?
multiple choice
activation gates are closed, and inactivation gates are open.
activation gates are open, and inactivation gates are closed.
activation and inactivation gates are open.
activation and inactivation gates are closed.
activation and inactivation gates alternate between open and closed.

Explanation:

Voltage - gated sodium ion channels have two gates: activation and inactivation gates. At resting membrane potential, the activation gate is closed to prevent sodium influx, while the inactivation gate is open, ready for the next action potential cycle.

Answer:

Activation gates are closed, and inactivation gates are open.