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7 / 28  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, Biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11448/1.10
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