In skeletal muscle a summated contraction, resulting from two action potentials, produces greater force than a single twitch contraction:

Question

Accepted Answer

because when there is a second action potential shortly after the first one, calcium stays in the cytoplasm for longer and the cross-bridges have more time to exert their full force.

Answer

only if the second action potential is bigger than the first action potential.

Answer

because the second action potential causes more ATP to be made available to provide more energy for the contraction.

Answer

because the second action potential stimulates more muscle fibres to contract.

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In skeletal muscle a summated contraction, resulting from two action potentials,...

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