Which of the Following Statements Regarding Contraction in Skeletal and Smooth

question 51

Multiple Choice

Which of the following statements regarding contraction in skeletal and smooth muscle is TRUE?

• A)In skeletal muscle,calcium initiates contraction by binding to troponin,while in smooth muscle calcium initiates contraction by binding directly to myosin.
• B)In skeletal muscle,calcium ions bind to a regulatory protein on thin filaments;in smooth muscle,calcium ions bind to a regulatory protein on thick filaments.
• C)In skeletal muscle,calcium initiates contraction by binding to myosin light-chain kinase,while in smooth muscle calcium initiates contraction by binding directly to tropomyosin.
• D)In skeletal muscle,calcium initiates contraction by binding to troponin,while in smooth muscle calcium initiates contraction by binding to calmodulin.
• E)All of the choices are true.

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