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During the rising phase of a typical neuronal action pote... | QuestionStock

Representative image for question: During the rising phase of a typical neuronal action potential, which ion flows rapidly into the neuron to depolarize the membrane?

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Science

During the rising phase of a typical neuronal action potential, which ion flows rapidly into the neuron to depolarize the membrane?

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During the rising phase of a typical neuronal action potential, which ion flows rapidly into the neuron to depolarize the membrane?

Options:

Sodium (Na+)
Potassium (K+)
Calcium (Ca2+)
Chloride (Cl-)

Correct answer: Sodium (Na+)

Explanation: Voltage-gated sodium channels open and Na+ rushes into the cell, causing rapid depolarization; this inward Na+ current often peaks within about 1 ms in many neurons.

Created 2026-03-10T17:33:53.065Z. Updated 2026-03-10T17:33:53.065Z.