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How might the body control the strength of leg muscle contractions when lifting a heavy object?

08 Nov 2009

8 Nov, 2009  muscle might

A. increase the frequency of action potentials sent to the leg muscles
B. increase the number of thick & thin filaments during contraction
C. stimulate more motor units to contribute to the muscle contraction
D. both A and C
E. both A and B

D. both A and C

Both increasing the frequency of action potentials and stimulating more motor units contribute to increased strength. The body DOES NOT increase the number of thin and thick filaments.

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5 Responses

  1. zebot25

    2009 Nov 08 1

    D. both A and C

    Both increasing the frequency of action potentials and stimulating more motor units contribute to increased strength. The body DOES NOT increase the number of thin and thick filaments.
    References :
    Medical school

  2. gamercolyn12

    2009 Nov 08 2

    It is D. You can’t control the amounts of thick and thin filaments, unless you take a type of muscle relaxant or tightening pill. The action potentials are one way to control your leg strength. If you use more motor units, your muscle can expand or contract a lot easier. So your answer is D.
    References :

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