weak, small, atrophied. There is an assortment of things it can be called. Please go back in the lesson & search for the specific term.
Sorry the context of this question doesn’t make sense, can you explain further?
Answer:
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Your muscles. Some muscles are “voluntary.” They
are the ones you control, the ones that let you exercise—or
relax. Some muscles are “involuntary.” They just do their
job with no effort on your part—like your heart muscles.