BIO NMDCAT Neurons

nmdcat.online July 7, 2026

An excitatory postsynaptic potential (EPSP) brings the membrane potential closer to threshold by causing

A. Hyperpolarization

B. Localized depolarization

✓

C. Repolarization

D. The absolute refractory period

📝 Explanation

An EPSP involves the opening of cation channels (usually Na⁺), leading to a localized, graded depolarization that makes the postsynaptic neuron more likely to fire an action potential.

📖 Additional Information

Hyperpolarization
Localized depolarization
Repolarization
The absolute refractory period

An EPSP involves the opening of cation channels (usually Na⁺), leading to a localized, graded depolarization that makes the postsynaptic neuron more likely to fire an action potential.

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