Which statement is correct about smooth muscle contractio...

Which statement is correct about smooth muscle contraction regulation compared with skeletal muscle?

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ASmooth muscle uses troponin to move tropomyosin, just like skeletal muscle

Smooth muscle typically uses Ca2+-calmodulin and myosin light-chain kinase (MLCK) rather than troponin

CSmooth muscle cannot use Ca2+ for contraction

DSmooth muscle always has sarcomeres and striations

ESmooth muscle contraction depends on acetylcholine only and never on hormones

Explanation

Smooth muscle lacks troponin-based regulation; Ca2+ binds calmodulin, activating MLCK, which enables myosin to interact with actin. Smooth muscle is often hormonally and autonomically regulated.

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Back to Deck — Muscle Contraction, Muscle Tissue & Tendons

Source: entermedschool.org

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