During muscle cell contraction, what happens because of Ca ++ binding to troponin? A. The binding site on actin is uncovered. B. Acetylcholine (ACh) is released. C. The cross-bridge disengages from the thin fi lament. D. ATP hydrolyses to ADP.
Option A. During muscle cell contraction when ca++ binding to troponin then binding site on actin is uncovered.
