The pulmonary arteries have less elastic connective tissue than systemic arteries.
They allow for optimal gas exchange between blood and tissue, because of their very thin wall formed by few cells. It is important to make it clear that venous blood rich in carbon dioxide also circulates through the pulmonary artery, as well as arterial blood rich in oxygen that also passes through the pulmonary veins.
The pulmonary circulation carries deoxygenated blood from the right side of the heart to lungs and returns oxygenated blood to the left side of the heart. Pulmonary arteries have less elastic connective tissue as compared to systemic arteries. They have wider lumens than systemic arteries.
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