In the systemic arteries and capillaries c. Blood circulating in your body is composed of about 55 percent plasma 40 percent red blood cells 4 percent platelets and 1 percent white blood cells. Pin On Health An average-sized man has about 12 pints of blood in his body and an average-sized woman has about nine. . Red blood cell levels that are higher or lower than normal could be a sign of dehydration anemia or bleeding. Okay Option B capital areas are the sites that act but that act for the use of the distribution of the blood these air presented in the lungs and are used to pick up the oxygen and then it releases the co two therefore be is incorrect. The aorta is the largest artery in the body which delivers the blood to the rest of your body. It carries blood from your head neck arms and chest back to your heart. At rest most of the bodys blood supply resides in the pulmonary loop would be B. For starters it helps in cat...