The veins that return blood from the digestive organs and the spleen form the portal venous system. What large veins form this system? (Mark all that apply.)
A) Splenic vein
B) Inferior mesenteric vein
C) Gastric vein
D) Inferior vena cava
E) Intermediate mesenteric vein
Ans: A, B, C
Feedback: This portal venous system is composed of five large veins: the superior mesenteric, inferior mesenteric, gastric, splenic, and cystic veins, which eventually form the vena portae that enters the liver. The inferior vena cava is not part of the portal system. The intermediate mesenteric vein is a distracter for this question.
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