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The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs. The blood here passes through capillaries adjacent to alveoli and becomes oxygenated as part of the process of respiration.In contrast to the pulmonary arteries, the bronchial arteries supply nutrition to the lungs themselves.n the human heart, the pulmonary trunk (pulmonary artery or main pulmonary artery) begins at the base of the right ventricle. It is short and wideâapproximately 5 centimetres (2.0 in) in length and 3 centimetres (1.2 in) in diameter.
Embryologically, the pulmonary arteries originate from the truncus arteriosus (as does the aorta), and in the developed heart, the pulmonary trunk (pulmonary artery or main pulmonary artery) begins at the base of the right ventricle.s the circuit approaches the lung, the right pulmonary artery branches into two arteries, and both branches enter the lung at a medial indentation called the hilum of the lung. The upper branch is the superior lobar artery, which feeds into the superior lobe of the lung.