Figure shows schematic plan of blood circulation in humans with labels A to D. Identify the label and give its function/s. <br>

Question

( A ) C - Vena Cava - takes blood from body parts to right auricle, $PCO_2$= 45 mm Hg
( B ) B - Pulmonary artery - takes blood from heart to lungs $PO_2$ = 90 mm Hg
( C ) D - Dorsal aorta - takes blood from heart to body parts, $PO_2$ = 95 mm Hg
( D ) A - Pulmonary vein - takes impure blood from body parts, $PO_2$ = 60 mm Hg