Answers for FAQs on Blood What is blood? How much blood does a person have? Blood is the red colored fluid flowing continuously in our body's circulatory system. About 1/12th of the body weight of a healthy individual is blood. On an average there are about 5 – 6 liters of blood present. What is the composition of blood? Blood contains mainly a fluid called plasma in which are suspended cellular elements. Three types of cells: Red Blood Cells or RBC's, White Blood Cells or WBC's and tiny platelets form the cellular element. What are the functions of these components? (a) Plasma: acts as a vehicle to carry many substances like glucose, fats and proteins, enzymes and hormones, etc., in addition to the blood cells. (b) Red Cells: carry oxygen from lungs to various body tissues and take back carbon dioxide from the cells and tissues to be thrown out of body in the form of exhaled air. (c) White cells: mainly act as body scavengers and guards. They help in the immune system of t...
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