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Depolarization is when ___________ ions flow inside the neuron’s membrane.

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Depolarization is when ___________ ions flow inside the neuron’s membrane.

(a) Potassium

(b) Sodium

(c) Chloride

(d) Magnesium

This question was posed to me in unit test.

My question is based upon Cellular Membranes topic in portion Cellular Membranes of Cell Biology

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The correct answer is (b) Sodium

The best explanation: Depolarization is the flow of sodium ions into the membrane. These are positively charged and reduce the polarity of a cell with respect to external environment and are therefore cause depolarization.

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