n regards to excitation-contraction coupling, what does the action potential propagate along when it reaches the muscle?
Question
n regards to excitation-contraction coupling, what does the action potential propagate along when it reaches the muscle?
Solution
When the action potential reaches the muscle, it propagates along the sarcolemma. The sarcolemma is the cell membrane of the muscle fiber. From the sarcolemma, the action potential travels down into the muscle fiber through structures called T-tubules (transverse tubules). These T-tubules are invaginations of the sarcolemma that penetrate into the cell's interior, allowing the action potential to reach the sarcoplasmic reticulum. The sarcoplasmic reticulum then releases calcium ions, which are crucial for muscle contraction.
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