Test: High School Biology

1.

When an action potential reaches the axon of a neuron, what is the first event to occur?

Intracellular potassium rushes out of the cytoplasm

Extracellular potassium rushes into the cytoplasm

Extracellular sodium rushes into the cytoplasm

Calcium rushes into the cytoplasm

Intracellular sodium rushes out of the cytoplasm

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