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Which process must occur for a muscle to be able to relax? A. The concentration of calcium in the myofibril must decrease. B. The amount of ATP in the neuromuscular junction must increase. C. a nerve must initiate an action potential in the muscle fiber. D. Myosin and actin must attach to each other.

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Answer:

The correct option is A. which is the concentration of calcium in the myofibril must decrease.

Explanation:

  • Calcium allows the actin, myosin, and ATP to interact, causing cross bridge formation and muscle contraction.
  • Muscle relaxation occurs when calcium is pumped back into the sarcoplasmic reticulum, away from the actin and myosin.
  • When calcium moves in this way, the actin and myosin cannot interact, and the muscle relaxes.
  • So according to above information all option are wrong except A option.

Answer:

A. which is the concentration of calcium in the myofibril must decrease.

Explanation:

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