Physiology The relaxation of smooth muscle is associated with a reduction in free intracellular calcium ion concentration. The effect of the reduction is A Reestablishment of inhibition of actin-myosin interaction B Deactivation of enzymatic activity of the individual actin molecules C Decreased phosphorylation of myosin molecules D Reduced contractile interaction by blocking the active sites of the myosin molecules 💡 Explanation The relaxation of smooth muscle is associated with a reduction in free intracellular calcium ion concentration. The effect of the reduction is ✓ Correct Answer: C. Decreased phosphorylation of myosin molecules