The blood vessels are divided into two groups. Arteries and veins. Arteries, whose job it is to transport fresh blood from the heart to the organs, have a thicker vascular wall because the blood flows through here at a relatively high speed. The veins, on the other hand, transport the used blood at a lower speed, which is why they also have a significantly thinner vessel wall. The vessel walls are muscular and elastic. They can expand and contract. In the course of the years, diseases of the blood vessels are usually the first to appear. Debris occludes the arteries and veins, preventing blood flow. This then leads to the organs and tissues no longer being adequately supplied with nutrients and blood and also showing symptoms of illness. Occlusive diseases lead to insufficient blood flow in the organs and in the periphery. This inadequate supply then causes various diseases that affect not only the organs themselves, but also the cardiovascular system.