Thoroughly explain how your body gets oxygen and gets rid of carbon dioxide. Make sure to discuss the respiratory and cardiovascular system in great detail, including the flow of blood in the heart and the rest of the body as well as the diffusion of the gases into and out of the lung and body cells. You must use at least these terms appropriately in your essay: Diffusion, concentration, capillaries, venules, arteries, aorta, pulmonary artery, veins, arterioles, pulmonary vein, superior and inferior vena cava, one way valves, atrioventricular valves,