Differentiate between pulmonary artery and pulmonary vein.
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Explanation:
Thick wall as they both possess endothelium derived relasing factor.
Pulmonary ArteryPulmonary vein → one pair
→ Blood in pulmonary Artery is deoxygenated
→ Blood pressure is higher
→ Wall is thick & elastic
→ two pair
→ Blood is oxygenated
→ is comparatively lower
→ comparatively thinner
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