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A healthy individual has 12-16 gms of haemoglobin in every 100 ml of blood.A healthy adult man has, on an average, 5 millions to 5.5 millions of RBCs mm–3 of blood.Plasma is a straw coloured, viscous fluid constituting nearly 55 per cent of the blood.Erythrocytes, leucocytes and platelets are collectively called formed elements and they constitute nearly 45 per cent of the blood.