Define the Skeletal muscle
A. Binding of calcium ion to its receptor site on the actin molecule blocks the attachment of the head of the tropomyosin molecule to its binding site on the actin molecule.
B. The binding of ATP to tropomyosin causes detachment of the tropomyosin head from the actin molecule.
C. The head of a myosin molecule is activated (energized) during the hydrolysis of ADP (which is bound to the myosin head) to ATP and Pi.