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Q.
Pulmonary artery is different from pulmonary vein because it has
Haryana PMTHaryana PMT 2010
Solution:
Arteries have thick walls, narrow lumen but no valves. Endothelium is present in both arteries and veins. Arteries receive blood directly from the heart they must be able to withstand the immense pressure of the blood as it is forced out of the heart. Whereas veins cany blood towards the heart.