The blood returning to the heart from the lungs via the pulmonary vein has more:

  • A
    $RBC$ per $ml$ of blood
  • B
    Haemoglobin per $ml$ of blood
  • C
    Oxygen per $ml$ of blood
  • D
    Nutrient per $ml$ of blood

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The systemic circulation provides nutrients, $A$ and other essential substances to the $B$ and takes $C$ and other harmful substances away for elimination. Choose the correct option for $A, B$ and $C$.

How many times will a red blood corpuscle $(RBC)$ have to pass through the heart in its journey from the hepatic artery to the aorta?

Which alphabet indicates the dorsal aorta in the given diagram?

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