Control of Interaction of Thin Filament with Thick Filament in Skeletal

question 6

Multiple Choice

Control of interaction of thin filament with thick filament in skeletal muscle is amplified because

• A) Binding of Ca to calmodulin activates CAMK phosphorylation of the myosin light chains
• B) Binding of Ca to TnC causes movement of tropomyosin that covers multiple myosin
• binding sites on the thin filament
• C) Greater release of Ca from the sarcoplasm ic reticulum activates m ore m yofilaments
• D) Ca inhibits the protein phosphatases that dephosphorylate the myosin light chains
• E) Repetitive stimulation keeps the [Ca²⁺] up longer

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