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Blood Capillaries. The blood capillaries are where the important functions of the circulation take place: the exchange of material between circulation and cells. Capillaries are the smallest of the body's blood vessels. They are only one cell thick, and they are the sites of the transfer of oxygen and other nutrients from the bloodstream to other tissues in the body; they also collect carbon dioxide waste materials and fluids for return to the veins.
Blood Vessels: Arteries: These are large blood vessels that take oxygenated blood away from the heart to be distributed throughout the body. The aorta is the body's largest artery. Veins: These blood vessels take deoxygenated blood from around the body back to the heart and lungs to be oxygenated.Capillaries: These tiny blood vessels are where the exchange of oxygen and nutrients take place. The nutrients and oxygen are exchanged for wastes that are taken from the cells.eins: These blood vessels take deoxygenated blood from around the body back to the heart and lungs to be oxygenated. Capillaries: These tiny blood vessels are where the exchange of oxygen and nutrients take place.