Which of the myofilaments of a muscle fiber has the active sites to which the heads of the thick filaments will bind?

Question

Quizplus · Accepted Answer

Actin has the active sites to which the heads of the thick filaments (myosin) bind during muscle contraction. Tropomyosin and troponin are regulatory proteins that control the exposure of the active sites on actin. Sarcoplasm is the cytoplasm of muscle cells and is not directly involved in muscle contraction.

Which of the Myofilaments of a Muscle Fiber Has the Active