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ARTERIES

Arteries are blood vessels that carry blood away from the heart. All arteries, with the exception of the pulmonary and umbilical arteries, carry oxygenated blood. Aorta is the largest artery. Arises from heart.

CAPILLARIES

Capillaries are the smallest of a body's blood vessels and are part of the microcirculation. They are only 1 cell thick. These micro vessels, measuring 5-10 cm in diameter, connect arterioles and vernicles, and enable the exchange of water, oxygen, carbon dioxide, and many other nutrient and waste chemical substances between blood and surrounding tissues.

VEINS

In the circulatory system, veins are blood vessels that carry blood toward the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood. They differ from arteries in structure and function. for example, arteries are more muscular than veins and they carry blood away from the heart.

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11y ago

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