RED BLOOD CELLS: , Biconcave disc shape, no nucleus when matured, , contain haemoglobin, about 120days lifespan, about 5.4 millions in number, carry oxygen, WHITE BLOOD CELLS: , , , large and irregular shape, about 7000 in number, protect our body by killing pathogens, large and colourless, lymphocytes, phagocytes, BLOOD PLATELETS: , 1/5 to 1/3 the size of a normal RBC, very small irregular shape, very small cell fragment with no nucleus, involved in blood clotting to prevent further blood loss,
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Blood cell types
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Lpn
Senior Secondary (HKDSE)
Biology
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