Trace the flow of blood in the general circulation. Compare this to the flow of blood as it leaves the digestive system, ending at the heart
Blood leaving the right side of the heart circulates through the lungs and then back to the left side of the heart. The left side of the heart then pumps the blood out of the aorta through arteries to all systems of the body. The blood circulates in the capillaries, where it exchanges material with the cells and then collects in veins, which return it again to the right side of the heart (heart to arteries to capillaries to veins to heart).
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Blood leaving the digestive system, however, goes by way of a vein. The hepatic portal vein directs blood not back to the heart but to the liver. The vein branches into a network of large capillaries so that every cell of the liver has access to the blood. Blood leaving the liver then collects into the hepatic vein, which returns blood to the heart (heart to arteries to capillaries in the intestines to hepatic portal vein to capillaries in the liver to hepatic vein to heart).
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