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Regulation of muscle contraction by Ca2+, troponin, and tropomyosin

lna445

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11 years ago Edited: 11 years ago, lna445

Regulation of muscle contraction by Ca2+, troponin, and tropomyosin

1. Which of the following statements correctly describe(s) the relationship between Ca2+ concentration in the cytosol and the response in the sarcomere? (Mark all that may apply)
A. Increasing Ca2+ concentration causes movement of tropomyosin, exposing myosin-binding sites on actin.
B. Increasing Ca2+ concentration causes troponin to bind to tropomyosin.
C. Decreasing Ca2+ concentration promotes interactions between actin and myosin.
D. Decreasing Ca2+ concentration causes dissociation of Ca2+ from troponin.
E. Increasing Ca2+ concentration causes troponin and tropomyosin to bind to actin.

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