The Grand Canal within the body

The human vascular system, known as the "river of life," is a closed circulatory network composed of arteries, veins, and capillaries. Arteries transport oxygen rich and nutrient rich blood from the heart, while veins collect tissue exchanged blood from the heart. Capillaries are important sites for material exchange between blood and cells.

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There is a "network" composed of intersecting blood vessels in the human body, which can be called the "river of life". Blood vessels are the channels of life, and the human vascular system is a closed circulatory system composed of arteries and veins. The total length of a single blood vessel in the whole body is about 100000 kilometers, and it can circle the equator 4 times. The total circulation distance of the whole body's blood in 24 hours is about 264000 kilometers, which is more than 20 times the sum of the lengths of the Yangtze River and the Yellow River. Blood vessels are the channels that guide blood flow to various parts of the body. Except for hair, nails, and the epidermis, there are many large and small blood vessels distributed in other parts of the body, which can be divided into three categories: arteries, veins, and capillaries.