Complete Question
_______ has an affinity for myosin binding sites in the absence of calcium.
Answer:
Tropomyosin
Step-by-step explanation:
Tropomyosin is one of the protein that can be found in the muscles of the body. Tropomyosin is an integral and regulatory protein that is involved in the contraction of the muscles in the body and it prevents the unregulated contraction of the muscles.
In the absence of calcium ions, tropomyosin has an affinity to myosin binding sites. Tropomyosin attaches itself to muscle protein actin and prevents the formation of the cross bridge. This prevents myosin from binding or attaching itself to actin which then results to the prevention of the contraction(shortening and tightening) of the muscles of the body.