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22 September, 01:29

When the current reached the following stages, what proportion of fibers in the muscle were contracting? a) at threshold b) at the maximal stimulus c) above the maximal stimulus

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  1. 22 September, 04:21
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    A) few B) 100% c) 100%

    Explanation:

    Muscle responds a stimulus which is capable of generating action potential. Muscle response is in a way of "ALL or NONE". Muscle response to greater stimulus by recruiting more muscle fibers.

    A) At threshold there would be only a small proportion of muscle is contracting.

    B) At maximal stimulus the maximum number (100%) of recruitable fibers are contrating.

    C) The number of recruitable fibers can't increase above maximal stimulus because already the maximum number of recruitable fibers are contracting.
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