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Figure shows schematic plan of blood circulation in humans with labels A to D. Identify the label and give its function/s.
A
D-Dorsal aorta – takes blood from heart to body parts, $PO_2$ = 95 mm Hg
B
A-Pulmonary vein – takes impure blood from body parts, $PO_2$ = 60 mm Hg
C
B-Pulmonary artery – takes blood from heart to lungs, $PO_2$ = 90 mm Hg
D
C-Vena Cava – takes blood from body parts to right auricle, $PCO_2$ = 45 mm Hg
Detailed Solution
C is the vena cava, which brings deoxygenated blood from the body parts to the right auricle; its $PCO_2$ is 45 mm Hg.
The pulmonary vein carries oxygenated blood and the pulmonary artery carries deoxygenated blood.
The pulmonary vein carries oxygenated blood and the pulmonary artery carries deoxygenated blood.