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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 answer A Ca B Ca flows through aquaporins passes through membrane channel proteins 2 Ca is transported through transmembrane ATPases Ca directly diffuses through the membrane bilayer

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