The primary role of calcium in the activation of smooth muscle contraction is to ----- A. depolarize the muscle cell plasma membrane. B. unblock the binding sites on actin for myosin. C. activate myosin light chain kinase (MLCK) to dephosphorylate myosin. D. release the neuromuscular neurotransmitter from the T-tubule. E. None of the above.
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This increase in calcium allows for the interaction between actin and myosin, leading to muscle contraction. Option A: Depolarizing the muscle cell plasma membrane is not the primary role of calcium in smooth muscle contraction. Depolarization is typically Show more…
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What is the role of calcium in muscle contraction? a. Its binding to a regulatory protein causes the protein to move, exposing actin binding sites to the myosin heads. b. It provides energy for contraction. c. It blocks contraction when the muscle relaxes. d. It forms the heads of the myosin molecules in the thick filaments inside a muscle fiber.
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