Blood and blood vessels

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Blood and blood vessels

  1. 1. Blood And Blood Vessels
  2. 2. What is blood?Itis a tissueMostly made of plasmaPlasma carry proteins that strengthens the immune system
  3. 3. Red Blood CellsCarryoxygenHave a lifespan of about 120 days
  4. 4. White Blood CellsItwards off infectionNumber of white blood cells in our body is lower than the red blood cells in the body
  5. 5. PlateletsHelps blood to clotClotting prevents blood from flowing out of a body when the artery or vein is broken
  6. 6. VeinsVeins are similar to arteries except that they transport blood at a lower pressure and they are not as strong as arteries.It receives blood from the capilaries after the exchange of oxygen and carbon dioxide has taken place.
  7. 7. ArteriesIt supplies fresh oxygen rich blood to the bodyThey are tough on the outside and smooth on the inside so as to allow the blood to flow smoothly
  8. 8. CapillariesThey are very thin and fragile.They are so thin that blood cells can only pass through them in a single file.The exchange of carbon dioxide and oxygen takes place through the thin capillary wall.

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