The blood

Our blood carries oxygen and nutrients to be delivered to the body tissues, and waste to be removed from the body.

It is composed of the following components.

Red blood cells

  • Contains haemoglobin which binds to oxygen.

White blood cells

  • Part of our immune system that fights infection.
  • Destroy bacteria and other harmful organisms.


  • Form clots to prevent blood loss.
  • Begin initial stage of tissue repair.


  • Straw coloured liquid component of blood.
  • Comprised mainly of water.

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