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Depolarization, the process by which muscle fibers are stimulated to contract, occurs when:
a. calcium ions rapidly enter the cell, facilitating contraction.
b. potassium ions escape from the cell through specialized channels.
c. cell wall permeability changes and sodium rushes into the cell.
d. cardiac muscle relaxes in response to a cellular influx of calcium.
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Depolarization, the process by which muscle fibers are stimulated to contract, occurs when:
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