Biology
In a coloured diagram, why do we generally show the pulmonary artery in blue and pulmonary vein in red colour ?
Circulatory System
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Answer
Conventionally, all veins are shown in blue colour and all arteries are shown in red colour. But pulmonary vein and artery are exceptions to it. The pulmonary artery is shown in blue as it contains deoxygenated blood and pulmonary vein is shown in red colour because it contains oxygenated blood.
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