BIO NMDCAT Neurons

nmdcat.online July 7, 2026

In neurophysiology, the critical voltage level to which a membrane must be depolarized to initiate an action potential is known as the

A. Resting potential

B. Threshold potential

✓

C. Spike potential

D. After-hyperpolarization potential

📝 Explanation

The threshold potential (usually around -55 mV) is the tipping point where voltage-gated Na⁺ channels open en masse, triggering the explosive positive feedback loop of an action potential.

📖 Additional Information

Resting potential
Threshold potential
Spike potential
After-hyperpolarization potential

The threshold potential (usually around -55 mV) is the tipping point where voltage-gated Na⁺ channels open en masse, triggering the explosive positive feedback loop of an action potential.

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