<prompt> Which of the following values indicate normal poal venous pressure?5 - 10 mm Hg10 - 15 mm Hg20 - 25 mm Hg25 - 30 mm Hg  <response>: Normal poal venous pressure is 5 - 10mmHg 10 - 15cm saline. Poal venous system contributes 75 of blood and 72 of oxygen supplied to the liver. Poal vein is formed by the confluence of superior mesenteric vein and splenic vein. In an average adult 1000-1500ml min of poal venous blood is supplied to the liver. Reference: Schwazs Principles of Surgery 9e chapter 31. 