Adequate supply of oxygenated blood will travel to all parts of the body. Follow the pathway of blood from the vena cava where it enters the heart, to the aorta where it finally leaves the heart to circulate through the rest of the body. Fill in the spaces with the names of the structures through which the blood must pass. The vena cava brings blood loaded with CO_2 to the (a). Which delivers the blood to the (b)? This chamber pumps the CO_2 loaded blood through the (c) to the (d) where the blood gives up its CO_2 and takes in (e) through the (f) The blood then returns to the heart(f) and enters the (g) .which pumps it through the. This chamber delivers blood into the (h) (i) to all parts of the body.