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

  • 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 atrium,$PCO_2 = 45 \, mm \, Hg$

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