The given figure shows schematic plan of blood circulation in humans with labels A to D. Identify the label and give its functions?

Question

A - Pulmonary vein - takes impure blood from body parts, pO₂ = 60 mm Hg

B - Pulmonary artery - takes blood from heart to lungs, pO₂ = 90 mm Hg

C - Vena cava - takes blood from body parts to right auricle, pCO₂ = 45 mm Hg

D - Dorsal aorta - takes blood from heart to body parts, pO₂ = 95 mm Hg

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