More tension is developed during twitch summation than during a single twitch because the duration of elevated cytosolic Ca²⁺ concentration increases during summation, thus increasing the availability of cross-bridge binding sites.

Question

Quizplus · Accepted Answer

During twitch summation, multiple twitches occur so the cytosolic Ca2+ concentration remains elevated for a longer period of time, allowing for cross-bridge binding to occur more frequently and increasing tension development.

More Tension Is Developed During Twitch Summation Than During a Single