Which Statement Concerning in Twitch Summation Is Correct

Which statement concerning in twitch summation is correct?

A) The muscle fibre is stimulated again before the action potential has returned to resting potential.
B) The muscle fibre is stimulated again before the filaments have completely returned to their resting position.
C) Stronger muscle contractions occur with stronger action potentials.
D) Weaker muscle contractions in spite of stronger action potentials.

Correct Answer:

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