What Do Red Blood Cells Do?
Reviewed: Dr. Gromatzky
6. Veins, Arteries, and Capillaries
Our blood is transported to other parts of the body thanks to a network of blood vessels including veins arteries, and capillaries. Arteries make some of the largest blood vessels in the body and carry blood that is rich in oxygen away from the heart and lungs and to the rest of the body.
Our veins carry blood back toward the heart. Blood in the veins is darker than that in arteries because the oxygen has been used. Capillaries are the smallest of all blood vessels, and allow red blood cells to travel single file so their oxygen can be delivered directly to the tissue cells that need it.
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