Arteries and veins are the major blood vessels. If they are all essential, the veins and the arteries do not have the same role at all. Because we often confuse them, we take stock of their differences

It is generally believed that arteries differ from veins only in size, and that they are larger than veins. But the reality is a little more complex. Veins and arteries differ above all in their role in blood circulation. Arteries carry blood from the heart to the organs, while veins carry blood from the organs back to the heart.

The blood system is organized into two circulations. The small one between the heart and the lungs loads the blood with oxygen. The pulmonary arteries go from the heart to the lungs to fill up with oxygen, which will then be returned to the heart through the pulmonary veins.

The great circulation brings oxygen to the organs. In this case, the arteries contain oxygenated blood and the veins deoxygenated blood, which is the opposite of small circulation.
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