Portal Circulation Biology Quiz

**he portal circulation describes:** **a) Blood flow from the heart to the lungs** **b) Blood flow from the digestive system, pancreas, and spleen to the liver** **c) Blood flow from the liver directly back to the heart** **d) Blood flow from the kidneys to the liver** **Answer: b) Blood flow f...

**he portal circulation describes:** **a) Blood flow from the heart to the lungs** **b) Blood flow from the digestive system, pancreas, and spleen to the liver** **c) Blood flow from the liver directly back to the heart** **d) Blood flow from the kidneys to the liver** **Answer: b) Blood flow from the digestive system, pancreas, and spleen to the liver** **2. The Portal Vein:** **Venous blood from the digestive tube, pancreas, and spleen collects into:** **a) The hepatic artery** **b) The hepatic vein** **c) The portal vein** **d) The inferior vena cava** **Answer: c) The portal vein** **3. Portal Vein and Liver:** **Inside the liver, the portal vein:** **a) Narrows and disappears** **b) Connects directly to the inferior vena cava** **c) Branches and then re-forms into two hepatic veins** **d) Forms capillaries that connect to the pulmonary circulation** **Answer: c) Branches and then re-forms into two hepatic veins** **4. Hepatic Veins:** **Blood exits the liver through:** **a) The portal vein** **b) The hepatic artery** **c) Two hepatic veins** **d) The superior vena cava** **Answer: c) Two hepatic veins** **Referring to the Diagram (Page 2):** **5. Structures Contributing to Portal Circulation:** **Which structures send blood to the liver via the portal vein (portal circulation)?** **a) Head and upper limbs** **b) Lungs** **c) Trunk and lower limbs, digestive system** **d) Heart** **Answer: c) Trunk and lower limbs, digestive system (The diagram shows the digestive system in the portal circulation path.)** **6. Destination of Hepatic Veins:** **The hepatic veins empty into:** **a) The portal vein** **b) The inferior vena cava** **c) The superior vena cava** **d) The descending aorta** **Answer: b) The inferior vena cava (Trace the flow in the diagram.)**