Vascular smooth muscle is a type of muscle found in the walls of blood vessels, particularly in arteries and veins. Unlike skeletal muscle, which is under voluntary control, vascular smooth muscle operates involuntarily. Its primary function is to regulate blood flow and blood pressure by contracting and relaxing, which changes the diameter of the blood vessels. This muscle is essential for maintaining proper circulation throughout the body. When vascular smooth muscle contracts, it narrows the blood vessels, increasing blood pressure. Conversely, when it relaxes, the vessels widen, allowing for increased blood flow and reduced pressure. This dynamic process is crucial for responding to the body’s changing needs.