what is the composition of blood
Composition of blood. The blood is composed of cells, cell fragments and an aqueous solution (plasma). Blood makes up about 8% of the human body weight. It contains erythrocytes, leucocytes, thrombocytes (platelets) and plasma.The volume percentage of all blood cells in the whole blood is about 45% in adults (hematocrit).he acid-base homeostasis is regulated in the blood: Through the diffusion of gases between alveoli and blood in the lung (alveolar diffusion) oxygen diffuses from the alveoli into the blood due to the concentration gradient. It is taken up by the carrying protein hemoglobin (hem = iron-containing, globin = protein).