1 2 points What triggers the initiation of the cross-bridge formation during muscle contraction? Calcium interaction with troponin ATP attachment Myosin detachment Tropomyosin conformation
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This interaction is triggered by the binding of calcium to troponin. Show more…
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During muscle contraction Ca++ is released from the sarcoplasmic reticulum. What is this Ca++ doing? A. The Ca++ is binding to the actin. This results in the release of tropomyosin from the myosin-binding sites on actin. B. The Ca++ is binding to the troponin complex. This results in the release of troponin I from the complex, allowing tropomyosin to slide away from the myosin-binding sites on actin. C. The Ca++ is binding to the troponin complex. This results in the binding of troponin I to the complex, positioning tropomyosin over the myosin-binding sites on actin. D. The Ca++ is binding to the tropomyosin complex. This results in the release of tropomyosin from the complex, allowing troponin to slide away from the myosin-binding sites on actin.
Sri K.
Impulses that move down the T system of a muscle fiber most directly cause a. movement of tropomyosin. b. attachment of the cross-bridges to myosin. c. release of $\mathrm{Ca}^{2+}$ from the sarcoplasmic reticulum. d. splitting of ATP.
Impulses that move down the T tubules of a muscle fiber initially cause a. movement of tropomyosin. b. attachment of the cross-bridges to myosin. c. release of $\mathrm{Ca}^{2+}$ from the sarcoplasmic reticulum. d. hydrolysis of ATP to ADP
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