RED blood cells are an important component of the human circulatory system. The red blood cells are produced in the bone marrow. Your body has about 5.6 litres of blood. Red blood cells transport fresh oxygen throughout the body and eliminate carbon dioxide from your body. In addition, red blood cells also take nutrients, proteins and hormones all around the body in all places where they should be provided. The red blood cells have a lifetime of 120 days, and they die. It takes less than 20 seconds for a red blood cell to circulate throughout your body. That 5.6 litres of blood circulate in your body three times a minute. Over the course of a day, blood travels a total of 19,000 km. The red cells travel far beyond journeys that humans engage in.
