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Hepatic Portal System. carries venous blood from the digestive organs to the liver via portal vein; nutrient rich DOB absorbed from the GI tract is processed in the liver before entering the heart; is unique because it has capillary beds on both ends.
Veins. 1  Carry blood to the heart (always de-oxygenated apart from the pulmonary vein which goes from the lungs to the heart). 2  Have thin walls. 3  Have larger internal lumen lumen: The central cavity of a hollow structure in an organism or cell. 4  Contain blood under low pressure.5  Have valves to prevent blood flowing backwards.eins. 1  Carry blood to the heart (always de-oxygenated apart from the pulmonary vein which goes from the lungs to the heart). 2  Have thin walls. 3  Have larger internal lumen lumen: The central cavity of a hollow structure in an organism or cell. 4  Contain blood under low pressure. 5  Have valves to prevent blood flowing backwards.