In cardiac contractile cells,the L-type Ca₂+channels lie mostly in the:

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The L-type Ca2+ channels in cardiac contractile cells are located predominantly in the transverse (T) tubules. These channels are responsible for the influx of Ca2+ into the cell, which triggers muscle contraction. The sarcolemma and outer membrane do not typically house significant numbers of these channels, and the sarcoplasmic reticulum is primarily responsible for releasing Ca2+ into the cytoplasm once it has been taken up by the cell. The pericardial sac is a fibrous membrane that encloses the heart and does not play a direct role in cardiac muscle contraction.

In Cardiac Contractile Cells,the L-Type Ca₂+channels Lie Mostly in The