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A muscle cramp is a sudden, painful contraction of a muscle, during which movement is difficult. What is happening at the cellular level during a muscle cramp?
A.  

A lack of calcium causes the sarcomeres to lock together, preventing relaxation.

B.  

Myosin and actin do not fully detach, so the muscle cannot relax.

C.  

The proteins in the myofibrils become denatured, preventing relaxation.

D.  

The motor neuron does not send a signal, so the muscle cannot relax.

Respuesta :

The answer to your question is B, Myosin and actin do not fully detach, so the muscle cannot relax.


Hope this helps!



During a muscle cramp, the myosin and actin do not fully detach and muscles fail to relax.  

• A sudden and involuntary contraction or over shortening of muscle is termed a cramp. Cramps can take place in a smooth muscle or a skeletal muscle.  

• The cramps of skeletal muscle may take place due to a lack of electrolytes like sodium or muscle fatigue.  

• Cramps generally take place when the muscles fail to relax adequately because of the myosin proteins, which fail to detach fully from the actin filaments.  

• The ATP levels must be large enough in skeletal muscle to combine with the myosin heads for them to detach or attach from the actin and permit relaxation or contraction.  

• However, in the absence of adequate ATP levels, the myosin heads remain attached to actin filaments and cramps take place.  

Thus, option B is correct, that is, the myosin and actin do not detach fully, and the muscles fail to relax.  

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