In smooth muscle,cross-bridging occurs due to
A) calcium binding to troponin.
B) calcium binding to calmodulin.
C) myosin kinase adding a phosphate to myosin heads.
D) both calcium binding to troponin and calmodulin.
E) both calcium binding to calmodulin and myosin kinase adding a phosphate to myosin heads.
Correct Answer:
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