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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.

Relax

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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