White blood cells:  , They fight infection, repair damaged tissue, and destroy bacteria., They have a nucleus and are much larger than red blood cells., Plasma: It’s straw coloured and is 90% water. It makes up 55% of the volume of blood. , , It transports proteins and other chemicals around the body., Platelets: , These are in charge of clotting the blood. They clot at the surface after a graze or cut., No nucleus. Consist of small fragments of cells., Red blood cells: , They are produced in bone marrow of long bones. Their job is to carry oxygen. , They have a biconcave shape and contain a pigment called haemoglobin that binds to oxygen.,

B4.1 The blood

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