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Title: Regulation of muscle contraction by Ca2+, troponin, and tropomyosin Post by: lna445 on Nov 14, 2012 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. thanks! Title: Re: Regulation of muscle contraction by Ca2+, troponin, and tropomyosin Post by: bolbol on Jan 17, 2021 Content hidden
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