Difference between venous and arterial blood.

The blood that constantly circulates in the body is not the same everywhere. In some parts of the vascular system, it is venous, in others it is arterial. What is this substance in each case, and how does venous blood differ from arterial blood? This is discussed below.

General information

Among the functions of blood, the most important is the supply of food and oxygen to the tissues, as well as the release of the body from metabolic products. All this movement of a vital fluid occurs along a closed path. At the same time, there is a division of the system into two sectors, called the circulation circles. Small - passes through the lungs, where oxygen enters the blood. Large - permeates the entire body, its organs and tissues.

The heartbeats make the blood move. The largest vessels go directly from this organ. Gradually they narrow, branch and pass into capillaries. Arteries, veins and smaller vessels are shown below and the movement of blood is shown:

Comparison

Each blood type has its own composition. Arterial is one that is saturated with oxygen. In addition, it contains a sufficient amount of useful elements, since it nourishes the cells of the body. In a large circle, such blood flows, respectively, through the arteries, in the direction from the heart. But in small, despite the name, - through the veins.

The opposite is true for venous blood. In a large circle, it moves to the main organ through the veins, and in a small circle, it goes from the heart to the lungs through the arteries. Such blood carries a lot of carbon dioxide and metabolic products, but there are practically no all kinds of nutrients in it. Arterial blood turns into a liquid with the specified composition after the release of useful components to the tissues of the body. Thus, an important substance, circulating along a closed path, regularly changes its type when passing certain sections.

Let us name other signs that distinguish venous blood from arterial blood. The visually differentiating factor is color. In venous blood it is deep, dark red with cherry tint. The arterial fluid, in turn, is brighter. It was revealed that its temperature is somewhat lower.

Another feature that can be compared is the speed of the train of both types. So, venous blood has a more measured course. This is due to the action of some physical forces, and the fact that the veins are equipped with valves that control such movement. By the way, these vessels are clearly visible under the skin in certain areas of the body, for example, in the wrist area.

Due to the low pressure, venous blood, which is also thicker, comes out calmly when the body is damaged. It is easier to stop it. Meanwhile, arterial bleeding, which has an intense pulsating character, is very difficult to cope with. This phenomenon is very dangerous for human life.

What is the difference between venous and arterial blood? The fact is that when determining diseases, the first type of material is more often taken. After all, it is venous blood, saturated with waste products, that can tell more about any malfunctions in the body.

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