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7 / 25  In relaxed muscle, the myosin-binding site on actin is blocked by ________.
A  titin
B  troponin
C  myoglobin
D  tropomyosin

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Source:  OpenStax, Human biology. OpenStax CNX. Dec 01, 2015 Download for free at http://legacy.cnx.org/content/col11903/1.3
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