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To initiate a smooth muscle cell contraction, calcium enters the cell and binds to A) troponin, which then activates myosin light-chain kinase.B) calmodulin, which then binds to and activates myosin light-chain kinase.C) a myosin head, which then activates calmodulin.D) myosin light-chain kinase, which then hydrolyzes ATP.E) a phosphatase, which then removes the tropomyosin blockade.

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