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The sarcolemma, or muscle cell plasma membrane, helps maintain a concentration gradient of calcium ions...

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The sarcolemma, or muscle cell plasma membrane, helps maintain a concentration gradient of calcium ions (Ca+) between a muscle cell's cytoplasm and the extracellular fluid. When a muscle cell receives a signal to contract, Ca+ moves down this gradient, passing from the extracellular space into the cytoplasm of the cell.Which of the following is the most likely mechanism by which Ca+ moves across the sarcolemma during muscle cell contraction?Choose 1 answerCa+ is transported through transmembrane ATPases.Ca+ passes through membrane channel proteins.Ca+ flows through aquaporins.Ca+ directly diffuses through the membrane bilayer.

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