After birth the pulmonary artery is the only artery in the body that:
a. has a high concentration of hemoglobin c. carries deoxygenated blood
b. has a high-pressure vascular bed d. returns blood to the heart
C
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A Incorrect. The pulmonary artery carries deoxygenated blood. Since most oxygen carried in the blood is bound to hemoglobin and the pulmonary artery carries deoxygenated blood, it does not have a high concentration of hemoglobin.
B Incorrect. The pulmonary vascular bed is a low-pressure vascular bed.
C Correct. After birth the pulmonary artery is the only artery in the body that carries deoxygenated blood. All other arteries including the aorta carry oxygenated blood.
D Incorrect. The pulmonary artery carries blood from the right ventricle to the lungs for oxygenation. It does not return blood to the heart.
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