Which statement is correct for twitch summation?

Question

Quizplus · Accepted Answer

Twitch summation results from increasing the frequency at which motor units are firing within a muscle, leading to a gradual increase in the strength of muscle contraction. This is also known as temporal summation. A high level of calcium ion is necessary for muscle contraction, including twitch summation. Choice A is incorrect because twitch summation occurs due to increased stimulation of a muscle, not weak contraction. Choice B is incorrect because increasing the number of motor units firing leads to recruitment, not summation. Choice D is incorrect because calcium ion is essential for muscle contraction, including twitch summation.

Which Statement Is Correct for Twitch Summation