What differentiates conducting and distributing arteries?

The cardiovascular system is a closed circuit of vessels that begins and ends at the heart. Among the vessels, three main types can be distinguished: arteries, capillaries and veins. Arteries are responsible for transporting blood from the heart to the organs, capillaries for exchanging gases and nutrients with tissues, and veins carry blood back to the heart.

The general structure of blood vessels consists of three concentric layers of different tissues, known as tunics:

tunica intima: is the layer that covers the inner part of the vessel and is formed by endothelial tissue. Middle tunic: made up of smooth muscle tissue. Adventist tunic: It is the outermost layer and is composed of connective tissue.

A characteristic of the arteries is that they have a much thicker tunica media than the rest because they are the ones that receive the impulse from the heart directly and distribute the blood throughout the body, a function for which they need a more developed muscular layer.

Within the arteries, two main types can be distinguished, the conducting arteries and the distributing arteries, which differ mainly in their size, specific function and variations in the composition of the tunica media, mainly in the amount of muscle tissue.

conducting arteries

They are also known as elastic arteries. They are the biggest and biggest arteries. The tunica media is very elastic thanks to the large number of collagen and elastin fibers. The amount of muscle tissue is low compared to the distribution arteries. There are few in the body, they are the aorta, the pulmonary arteries and the branches of both. After the heart contracts (systole), the conducting arteries stretch, absorbing the pressure produced by the beat. Then, thanks to their high elasticity, they quickly return to their normal diameter by means of an elastic recoil that pushes the blood towards the organism. Elastic recoil also pushes blood back to the heart once systole ends and before the aortic valve closes. This retrograde flow produced by the elastic recoil of the conducting arteries is known as the windkessel effect.
See also  How do I get .NET certification?

Distribution arteries

They are also known as muscular arteries, although this name is not very appropriate. They are medium caliber arteries. They are formed from branches of the conducting arteries. Its function is to distribute the blood that arrives from the conducting arteries to the different organs. Your middle tunic has a lot of smooth muscle whose contraction and expansion is essential for maintaining blood pressure and circulating blood to different parts of the body as needed, expanding in parts of the body that need more blood supply and contracting in parts that need it. less. Following the conducting arteries are those known as resistance vessels, which are small arteries, arterioles, and, to a lesser extent, capillaries. They are much more numerous than the conducting arteries. These are distribution arteries, for example, the radial artery or the splenic artery.

Leave a Comment