Red blood cells - carry oxygen around the body through a reversable reaction between haemogolbin and oxygen to form oxyhaemogolbin . A red blood cell contains iron in its centre and can make bonds with 4 oxygens the reaction with CO ( carbonmonoxide is not reversable and this is why it is dangerous to humans and it makes the cell unable to carry oxygen around the body- many many of these in the blood
White blood cells- fight pathogens ( things that cause disease) by engulfing them or by firing out antibodies to make it in active - more often than not both of these processes happen to a pathogen. Phagocytes engulf and digest through the process of phagocytosis. Lymphocytes have a big nucleus compared to their size and contain information/ memory of passes infections on how to make antibodies to attach on to the antigens of a pathogen. Very few in the blood compared to red blood cells
platelets - form scabs when you get cut enable a chemical reaction
Plasma- is a straw coloured liquid that transports things like hormones around the body and contains water
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