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171238 Physiology

The force of a twitch is less than that in a tetanus, BECAUSE:

AOne action potential does not release sufficient Ca++ to saturate the troponin binding sites
BCa++ reuptake into the sarcoplasmic reticulum is so rapid that there is insufficient time for all the troponin Ca++ -binding sites to be occupied
CCrossbridge cycling is not fast enough to allow expression of the maximum possible force before Ca++ dissociates from troponin
DAll of the above
Physiology
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