<P> Blood accounts for 7 % of the human body weight , with an average density around 1060 kg / m , very close to pure water 's density of 1000 kg / m . The average adult has a blood volume of roughly 5 litres ( 11 US pt ) , which is composed of plasma and several kinds of cells . These blood cells ( which are also called corpuscles or `` formed elements '' ) consist of erythrocytes ( red blood cells , RBCs ) , leukocytes ( white blood cells ) , and thrombocytes ( platelets ) . By volume , the red blood cells constitute about 45 % of whole blood , the plasma about 54.3 % , and white cells about 0.7 % . </P>
<P> Blood accounts for 7 % of the human body weight , with an average density around 1060 kg / m , very close to pure water 's density of 1000 kg / m . The average adult has a blood volume of roughly 5 litres ( 11 US pt ) , which is composed of plasma and several kinds of cells . These blood cells ( which are also called corpuscles or `` formed elements '' ) consist of erythrocytes ( red blood cells , RBCs ) , leukocytes ( white blood cells ) , and thrombocytes ( platelets ) . By volume , the red blood cells constitute about 45 % of whole blood , the plasma about 54.3 % , and white cells about 0.7 % . </P>
the formed elements in the blood are mostly
the formed elements in the blood are mostly
red blood cells
red blood cells