BLOOD

Blood is a fluid component of our body.it has 55% of plasma and 45% cells..45% cells includes-red blood cells,,white blood cells,,platelets.. There are 5 million cells/mm3 red blood cells,,4000-11000 cells/mm3 white blood cells,,1.5 lakhs cells/mm3 platelets.....red blood cells help in transporting oxygen and carbondioxide and also other substances.white blood cells help in defense mechanism...platelets help in blood coagulation...