Structurally, the blood is very different to the other fluids in the body. In one sense, blood is actually a tissue, just like bone or muscle. However, while the cells that comprise these other tissues are bound tightly together, cells composing the blood are not attached to one another. Individual blood cells—known as erythrocytes, leucocytes and thrombocytes—move freely distributed within the blood plasma.
Blood consists of 55% plasma and 45% blood cells. Water comprises from 90 to 92% of the plasma, the rest consisting of plasma proteins, amino acids, carbohydrates, fats, hormones, urea, uric acid, lactic acid, enzymes, alcohol, antibodies, and elements such as sodium, potassium, iodine, iron and bicarbonate. The blood cells float in this complex fluid.
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