What is blood?Itis a tissueMostly made of plasmaPlasma carry proteins that strengthens the immune system
Red Blood CellsCarryoxygenHave a lifespan of about 120 days
White Blood CellsItwards off infectionNumber of white blood cells in our body is lower than the red blood cells in the body
PlateletsHelps blood to clotClotting prevents blood from flowing out of a body when the artery or vein is broken
VeinsVeins 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.
ArteriesIt supplies fresh oxygen rich blood to the bodyThey are tough on the outside and smooth on the inside so as to allow the blood to flow smoothly
CapillariesThey 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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