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Blood is an important fluid that keeps us alive. We cannot live without it. The heart pumps blood to all parts of the body and brings them oxygen and food. At the same time blood carries all the substances we don’t need away from us. Blood fights infections, keep our body temperature the same and carries chemicals that control body functions. Finally, blood has substances that repair broken blood vessels so that we don’t bleed to death. Plasma is the liquid part of our blood. It makes up about 50-60% of it. Plasma consists dissolved food, chemicals that control our growth and do other jobs, proteins, minerals and waste products. Red blood cells look like flat round discs. They contain haemoglobin, a protein that carries oxygen to the body and gives blood its red color. Each drop of blood has about 300 million of these red cells.