Which molecules are involved with regulation of cross bridge attachment activity?

Question

Quizplus · Accepted Answer

Calcium ions are essential for allowing the myosin head to bind to the actin filament, and troponin helps to regulate the position of the tropomyosin molecule that covers the myosin binding site on actin. Therefore, both calcium ions and troponin are involved in the regulation of cross bridge attachment activity. Tropomyosin also plays a role in this regulation, but it works in concert with troponin. Therefore, the best choice is D, both (a) and (b) above. E, all these answers, is also technically correct, but D provides a more specific answer.

Which Molecules Are Involved with Regulation of Cross Bridge Attachment