The pulmonary artery carries oxygenated blood. You can remember this easily because all ARTERIES carry oxygenated blood and all VIENS carry deoxygenated blood.
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An artery is the vessel that carries blood away from the heart. The pulmonary artery carries only deoxygenated blood after birth.
it's a pulmonary VEIN because the blood isn't under as much pressure (because it has yet to get to the heart) where as the pulmonary artery is coming straight from the heart so is under more pressure. (the pressure is caused by the heart's contractions)
The pulmonary vein brings in oxygenated blood from the lungs through the left atrium and ventricle up into the aorta which then carries the oxygenated blood through the body. The vena cava (main vein) on the right side carries deoxygenated blood through the right atrium through the right ventricle up into the pulmonary artery, which carries the deoxygenated blood to the lungs to get oxygenated again. The pulmonary artery is the only artery to carry deaoxygenated blood.
The only artery that is supposed to carry deoxygenated blood is the pulmonary artery. It carried deoxygenated blood from the right ventricle to the lungs for oxygenation. Any artery can carry deoxygenated blood, so be careful how you word questions.
Pulmonary arteries carry deoxygenated blood from the right ventricle.