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10 / 22  During muscle contraction, the cross-bridge detaches when ________.
A  the myosin head binds to an ADP molecule
B  the myosin head binds to an ATP molecule
C  calcium ions bind to troponin
D  calcium ions bind to actin

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Source:  OpenStax, Anatomy & Physiology. OpenStax CNX. Feb 04, 2016 Download for free at http://legacy.cnx.org/content/col11496/1.8
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