Which of the Following Statements Regarding Smooth Muscle Versus Striated

question 42

Multiple Choice

Which of the following statements regarding smooth muscle versus striated muscle is FALSE?

• A)Calcium for skeletal muscle contraction enters the cell from the sarcoplasmic reticulum and through voltage-gated calcium channels in the plasma membrane, whereas the calcium for smooth muscle contraction enters the cell from the sarcoplasmic reticulum only.
• B)Smooth muscle contraction is regulated by the binding of calcium to calmodulin, whereas skeletal muscle contraction is regulated by calcium interacting with the troponin-tropomyosin system.
• C)Smooth muscle is activated by the autonomic nervous system, whereas skeletal muscle is activated by the somatic nervous system.
• D)Separate enzymes mediate the binding of myosin to actin through phosphorylation and dephosphorylation in smooth muscle, whereas the myosin heads of skeletal muscle function as enzymes themselves to hydrolyze ATP.
• E)Smooth muscle contracts longer and relaxes more slowly compared to skeletal muscle.

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