Nikolas
Created page with "We’ve talked a lot about vasoconstriction and vasodilation, but we haven’t yet discussed how these processes occur. Vessels have varying amount of smooth muscle in their walls, especially the arteries and arterioles. Vasoconstriction occurs when this smooth muscle contracts, and vasodilation occurs when this smooth muscle relaxes. I won’t describe the exact mechanism of smooth muscle contraction, but I will describe how different vasodilators and vasoconstrictors..."
