Which of the following is NOT true of the relaxation of a muscle fiber? A)ATP is needed to fuel the calcium pumps B)calcium release channels close C)the action potential must continue D)Ca²⁺ moves from the sarcoplasm to the sarcoplasmic reticula

Question

Quizplus · Accepted Answer

The relaxation of a muscle fiber does not require the action potential to continue. Once the action potential has stimulated the release of calcium ions from the sarcoplasmic reticulum, the contraction cycle proceeds even if the action potential stops. The relaxation process involves the re-uptake of calcium ions back into the sarcoplasmic reticulum with the help of ATP to fuel the calcium pumps. The closure of calcium release channels is also necessary for relaxation, as it prevents further release of calcium ions into the sarcoplasm. The movement of Ca2+ ions from the sarcoplasm to the sarcoplasmic reticulum is also part of the relaxation process, as it lowers the concentration of calcium in the sarcoplasm, which allows the muscle fiber to relax.

Which of the Following Is NOT True of the Relaxation