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Important functions of blood are given as under: 

  1. Transport of oxygen from the lungs to the tissues and carbon dioxide from the tissues to the lungs. 
  2. It carries food material absorbed from the intestines to the tissue, cells for growth, energy and repair process. 
  3. It carries the waste products of cellular activity and carries them to kidneys, lungs and intestines for excretion. 
  4. It carries hormones, vitamin and other chemicals to the place of need. 
  5. It helps to maintain water balance in the body. 
  6. It regulates the body temperature. 
  7. White blood cells of the blood acts as a defensive mechanism

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