Blood

Blood is an important fluid that keeps us alive. Amount of blood in your body depends on your size, weight and altitude at which you live. An adult who weight 80 kg has about 4.5 to 6 liters of blood, a 40 kg child, about half the amount. People who live in high area where the air is thinner need more blood to deliver more oxygen to the body. This essential fluid carries out the critical functions of transporting oxygen and nutrients to our cells and getting rid of carbon dioxide, ammonia and other waste products. In addition, it plays a vital role in our immune system and in maintaining a relatively constant body temperature. Blood is a highly specialized tissue composed of more than 4,000 different kinds of components. Four of the most important ones are Plasma, Red cells, White cells and Platelets.