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What process must occur for a muscle to be able to relax?
A. The amount of ATP in the neuromuscular junction must increase
B. A never must initiate an action potential in the muscle fiber
C. Myosin and actin must attach to each other.
D. The concentration of calcium in the myrofibril must decrease.

Respuesta :

B.  

Relaxation Phase

Cholinesterase released and acetylcholine breakdown

Sarcolemma & T-tubules repolarized

SR Ca++ pump activated & Ca++ returned to SR terminal cisternae

Actin-myosin crossbridge formation terminated

Return of tropomyosin to actin binding site

Mg++ complex formed with ATP

Passive sliding of filaments

Sarcomeres return to resting state

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