Question

a nerve cannot be stimulated while it is depolarized.

true

false

Explanation:

Define the physiological state of depolarization

During an action potential, depolarization occurs when voltage-gated sodium channels open, allowing sodium ions to rush into the neuron. This rapidly reverses the membrane potential.

Analyze the refractory period mechanism

While the membrane is depolarized, the voltage-gated sodium channels enter an inactivated state. During this absolute refractory period, it is physically impossible for these channels to reopen in response to another stimulus.

Evaluate the statement's validity

Since the sodium channels are inactivated and cannot reopen during depolarization, a nerve fiber cannot be stimulated to produce another action potential during this phase. Therefore, the statement is true.

Answer:

• TRUE (Correct answer)
• FALSE