What is the primary function of arterioles in the circulatory system?

The primary function of arterioles in the circulatory system is to regulate blood flow through capillaries. Arterioles are small blood vessels that branch off from arteries and lead into capillary networks. Their walls are muscular and can constrict or dilate, which allows them to control blood flow and blood pressure within the circulatory system. By adjusting their diameter, arterioles can increase or decrease the amount of blood that reaches various tissues, ensuring that more blood flows to areas that need it most while restricting flow to areas that are not as active.

Although arterioles do carry blood away from the heart, their most critical role lies in their ability to regulate microcirculation within tissues. This is essential for maintaining proper tissue perfusion, nutrient delivery, and waste removal.