Most of the time whole muscles do not contract at full strength because
A) we tend not to need the full capabilities of our muscles.
B) the muscle fibers will use up their energy reserves and the muscle will be forced to relax.
C) commonly the load is only the weight of our own body.
D) only a few motor units are recruited.
E) All of the answers are correct.
E) All of the answers are correct.
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