Your circulatory system transports nutrients and oxygen to billions of cells throughout your body. ...
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Your circulatory system transports nutrients and oxygen to billions of cells throughout your body. It is divided into 3 major parts: your heart, blood, and blood vessels. Red blood cells carry oxygen from your lungs to all your body's cells and pick up carbon dioxide to be carried back to the lungs and eliminated when you exhale. Blood is transported through blood vessels. Oxygen and nutrients pass from the blood into cells through the walls out of tiny vessels called capillaries. Angiogenesis is the process of growing new blood vessels from ones that have already formed. It is important for both good health and healing. However, it can also support the growth of cancer cells. Cells release chemical messengers, which activate cells in blood vessels to form new vessels that grow towards the source of the signals. Cancer cells grow uncontrollably and do not die like normal cells. The oxygen and nutrients supplied through new blood vessels support this growth. They also enable cancer cells to move through the vessels to other parts of the body.