Further Biology - Blood

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CAPILLARIES deliver food and oxygen to each cell

  • Capillaries use diffusion to deliver food and oxygen directly to body tissues and take carbon dioxide and other waste materials away
  • Walls only one cell thick to make it easy for substances to pass in and out of them
  • They have a very small hole down the middle
  • They are too small to see without a microscope

BLOOD is made up of  FOUR PARTS:

  • WHITE BLOOD CELLS
  • RED BLOOD CELLS
  • PLASMA
  • PLATELETS (small fragments of cells that help blood to…

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