The Interaction Between Actin and Myosin in Smooth Muscle Requires

question 44

Multiple Choice

The interaction between actin and myosin in smooth muscle requires

• A)the tropomyosin must be moved out of the way by troponin before myosin can bind to actin.
• B)the interaction between calcium and troponin to expose the myosin binding site on the actin molecule.
• C)that the calcium- calmodulin complex directly phosphorylates myosin light chain, allowing myosin to bind to actin.
• D)that the calcium- calmodulin complex activates myosin light- chain kinase, which phosphorylates myosin thereby allowing it to bind with actin.
• E)the activation of troponin, which stimulates myosin light- chain kinase to phosphorylate myosin light chain, allowing myosin to bind with actin.

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