Adult blood volume is 5 to 6 Liters.

Blood is a red coloured fluid that contains continuously renewing cells like red blood cells which renew every 4 months,
platelets that renew every week and also white blood cells.

The cells are swimming in the liquid part of the blood , the plasma.
The blood carries oxygen by RBCs from the lungs into the tissues to generate energy.
It carries out carbon dioxide to be expired through the lungs.

White blood cells play a key role in immunity.

Plalelets and plasma are responsible for stopping the bleeding from wounds by clotting of the blood.




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