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.
Myosin and actin do not fully detach, so the muscle cannot relax.
B.
The motor neuron does not send a signal, so the muscle cannot relax.
C.
A lack of calcium causes the sarcomeres to lock together, preventing relaxation.
D.
The proteins in the myofibrils become denatured, preventing relaxation.
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Answer:
d
Explanation:
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