Question:
The sarcolemma, or muscle cell plasma membrane, helps
Last updated: 7/8/2022
![The sarcolemma, or muscle cell plasma membrane, helps](https://media.kunduz.com/media/sug-question/raw/61930615-1657298523.363798.jpeg?h=512)
The sarcolemma, or muscle cell plasma membrane, helps maintain a concentration gradient of calcium ions (Ca²+) between a muscle cell's cytoplasm and the extracellular fluid. When a muscle cell receives a signal to contract, Ca²+ 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 Ca²+ moves across the sarcolemma during muscle cell contraction? Choose 1 answer Ca²+ is transported through transmembrane ATPases. Ca²+ passes through membrane channel proteins. Ca²+ flows through aquaporins. Ca²+ directly diffuses through the membrane bilayer.