complete the following statements.\nions are necessary to activate the binding sites on the actin…

complete the following statements.\nions are necessary to activate the binding sites on the actin filaments.\nthe molecule is required each time the myosin head detaches from one site and reattaches to another.

complete the following statements.\nions are necessary to activate the binding sites on the actin filaments.\nthe molecule is required each time the myosin head detaches from one site and reattaches to another.

Answer

Brief Explanations:

In muscle contraction, calcium ions ($Ca^{2+}$) bind to troponin - tropomyosin complex on actin filaments, exposing the myosin - binding sites on actin. ATP (adenosine tri - phosphate) provides the energy for the myosin head to detach from the actin site and reattach to another during the cross - bridge cycle of muscle contraction.

Answer:

  1. Calcium ($Ca^{2+}$)
  2. ATP (Adenosine Tri - Phosphate)