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Surplus red blood cells, needed to meet an emergency, are MAINLY stored in which organ of the human body?
 

  • A.pancreas
  • B.spleen
  • C.liver
  • D.kidneys 

Answer: B

Surplus red cells are stored mainly in the spleen.

It holds a reserve that contraction of its smooth muscle can release into the circulation during haemorrhage or strenuous exercise. The spleen also filters out worn-out red cells, which is why it is called the graveyard of erythrocytes.

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