In a vertebrate with a four-chambered heart,the structure(s)containing blood with the highest O₂ concentration is/are the ________. A)pulmonary arteries B)pulmonary veins C)right atrium D)inferior vena cava E)right ventricle

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The pulmonary veins carry oxygenated blood from the lungs to the left atrium, which then pumps it into the left ventricle and out to the body. This means that the blood in the pulmonary veins has the highest oxygen concentration in the body.

In a Vertebrate with a Four-Chambered Heart,the Structure(s)containing Blood with the Highest