What is one role of the liver in metabolism?

• A. Produces insulin
• B. Secretes bile to emulsify fats and processes blood from the GI tract
• C. Absorbs nutrients directly into lymph
• D. Stores bile

Answer: (B)

Metabolism relies on how the liver handles nutrients and fat digestion. The liver’s role in fat metabolism is to produce bile, which emulsifies fats and increases their surface area for pancreatic lipase to act on. This bile is secreted into bile ducts and ultimately stored in the gallbladder, making the liver’s secretion of bile a central metabolic function. Additionally, blood from the GI tract reaches the liver via the hepatic portal system, where nutrients are processed, detoxified, and distributed as needed. The other options point to functions of other organs—insulin is produced by the pancreas; nutrients are absorbed into lymph from the intestines, not the liver; and bile is stored in the gallbladder, not the liver.