Human have about 5 and 7 litres of blood circulating around your body. It contains cells floating in a pale yellow fluid called plasma.
Plasma is mainly water, carries a wide range of dissolved materials including food molecules, hormones, and waste products from cells, also helps to distrubute heat around the body.
Three types of cells floating in the plasma : -
- red blood cells - to transport oxygen
- white blood cells - to fight infection
- platets - which play an important role in blood clotting at an injury site.
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