Vasodilator

Vasodilation is the expansion of arteries and other vessels without any mechanical effect, but only due to a change in their shape. The effect on arteries and blood vessels can be direct and indirect. Direct pressure is exerted on the walls of the vascular bed themselves, or various cellular factors are used, such as prostaglandins Pg-E. The vasodilatory effect can manifest itself both in the structure of one of the cones of the retina, and in the receptor cells of the bladder, as well as neurons in the head and blood vessels. But there may also be indirect vasodilation when using two groups of substances, for example histamine or adrenaline. In these cases, a functional type of vasodilation may occur, i.e., indirectly by acting on the smooth muscles located inside the vessels. The mechanism of action of vasoactive drugs depends on the activity of a particular receptor. Dilatation of arterioles and