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16 February, 04:46

Select all that are true regarding a resting muscle fiber.

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  1. 16 February, 05:32
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    Out of the following given choices;

    1) There is a charge difference across the sarcolemma.

    2) Sodium-potassium pumps are active.

    3) Calcium is stored in the sarcoplasm.

    4) ACh receptors are open.

    The answer is 1, 3 and 4. When a muscle is at rest, the Ca2 + ions are still sequestered in the sarcoplasm until an impulse induces depolarization. ACh receptors are also not bound by acetylcholine which is the primary receptor-neurotransmitter in muscle for motor nerve-muscle communication that controls muscle contraction.
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