When does cross bridge cycling end?
A. Cross bridge cycling ends when calcium release channels in the sarcoplasmic reticulum open.
B. Cross bridge cycling ends when calcium ions are passively transported back into the sarcoplasmic reticulum.
C. Cross bridge cycling ends when sufficient calcium has been actively transported back into the sarcoplasmic reticulum to allow calcium to unbind from troponin.
D. Cross bridge cycling ends when ATP binds to the myosin head.
Answer: C. Cross bridge cycling ends when sufficient calcium has been actively transported back into the sarcoplasmic reticulum to allow calcium to unbind from troponin.
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