Why is functional division useful during surgery?

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The liver is organized into functionally independent segments, each with its own portal inflow, arterial supply, biliary drainage, and hepatic venous outflow. This segmented anatomy lets a surgeon remove just the portion affected by tumor or trauma while leaving the rest of the liver intact and functioning. Removing a diseased segment (or a larger portion if needed) preserves overall hepatic function and, thanks to the liver’s regenerative capacity, helps recovery after surgery. The other statements don’t fit because the division doesn’t enlarge the liver, it doesn’t cause random changes in blood flow, and this principle is a practical, real-world part of hepatic surgery, not just theoretical.