L OCATION BEHIND THE RIBS UPPER RIGHT PORTION OF ABDO CAVITY WEIGHT 1800 gm in male ,1400gm in females FOUR LOBES FUNCTIONAL UNITS CALLED LOBULES BLOOD CIRCULATION TO LIVER 75 % PORTAL VEIN FROM GI TRACT RICH IN NUTRIENTS 25% FROM HEPATIC ARTERY RICH IN OXYGEN TERMINAL BRANCHES OF THESE TWO VESSELS JOINS TO FORM CAPILLARY BEDS. HEPATIC VEIN DRAINS VENOUS BLOOD FROM LIVER.