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Question

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


  1. B - Pulmonary artery - takes blood from heart to lungs, Po2 = 90 mm Hg
  2. D - Dorsal aorta -takes blood from heart to body parts, Po2 = 95 mm Hg
  3. C - vena cava - takes blood from body parts to the right auricle, Pco2 = 45 mm Hg
  4. A - Pulmonary vein - takes impure blood from body parts, Po2 = 60 mm Hg


Solution

The correct option is C C - vena cava - takes blood from body parts to the right auricle, Pco2 = 45 mm Hg
In the given figure: A is pulmonary vein which brings pure blood from lungs to the left atrium, B is dorsal aorta which carries blood from heart to body parts, C is vena cava which carries impure blood from body parts to right auricle, and D is pulmonary artery which takes impure blood from heart to lungs. 

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