Figure shows schematic plan of blood circulation in human with labels - A to D. Identify the label and give its function/s.
A - pulmonary vein - takes impure blood from body parts, pO2 = 60 mmHg
B - pulmonary artery - takes blood from heart to lungs, pO2 = 90 mmHg
C - vena cava - takes blood from body parts to right auricle, pCO2 = 45 mmHg
D - dorsal aorta - takes blood from heart to body parts, pO2 = 95 mmHg
