BLOOD AND CIRCULATION

Blood is pumped to every part of your body by your heart. In an adult, up to 5 litres (8 pints) hurtle through arteries and veins, completing a double loop around the body in less than one minute. During this endless high-speed journey, blood delivers oxygen, collects waste, and supplies the substance that all your body's cells need to survive. Blood also helps the body to fight diseases, and it spreads warmth from one part of the body to another.