Thursday, March 10, 2011

[Science Form 3] Blood vessels and their functions

There are 3 types of blood vessels.
  • Arteries
    Have a thick muscular walls to withstand high pressure.

  • Veins
    The pressure in veins is usually low. Therefore, veins are wide and have thin walls with few muscles, which allow blood to flow more easily.

  • Capillaries
    Capillaries, which have very thin walls, join veins and arteries. They transfer gases, food and excretory products between blood and body cell by diffusion through their thin walls.

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