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The arteriovenous oxygen difference, or a-vO 2 diff, is the difference in the oxygen content of the blood between the arterial blood and the venous blood. It is an indication of how much oxygen is removed from the blood in capillaries as the blood circulates in the body.
The exception is the pulmonary artery, which carries oxygen-poor blood from the right ventricle to the lungs. Arterioles are smaller arteries that carry oxygen-rich blood. Arteries in the arterial blood system carry oxygenated blood. Veins in the venous blood system carry de-oxygenated blood.