blood

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  • having the right concentration of blood cells can make the difference between health and illness or between success and failure
    • red blood cells are a key role in fitness
      • red blood cells
        • most cells are discs called red blood cells or Erythrocyre
        • the pigment what give the colour to the red blood cells is called Haemoglobin
        • blood
          • Leukocyte- white blood cell
          • pathogen- an agent that causes disease, such as a virus

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