CIRCULATION
IN THE HUMAN BODY
How do veins work?
The venous system is composed of several different types of veins and venous valves. Veins are blood vessels that carry blood from throughout the body back to the heart. Superficial veins are veins that are visible just below the surface of the skin.

Deep veins are veins that run deep inside your leg muscles and carry the greatest portion of blood from your legs to your heart. Perforating veins connect the superficial veins and the deep veins.


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Venous valves float open to allow blood to flow toward the heart, and flap closed to prevent the flow of blood back down the extremities.


In healthy legs, veins have smooth, elastic walls that can adapt to changes in pressure within them and valves keep blood flowing in one direction back toward the heart. However, vein walls and valves can become weakened or damaged over time due to many causes. Some common causes are a hereditary disposition towards vein disease, pregnancy, prolonged sitting or crossing of the legs, prolonged standing, and obesity. When the venous system becomes weakened or damaged, it can lead to the development of vein disease.
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LEARN ABOUT DIFFERENT TYPES VEIN DISEASE
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