Liver's metabolic roles exclude enzyme secretion

Steps:

• Recall primary liver functions: metabolism, detoxification, and nutrient storage.
• Evaluate A: Liver metabolizes alcohol via alcohol dehydrogenase enzyme.
• Evaluate B: Liver performs glycogenolysis to convert glycogen to glucose for blood sugar regulation.
• Evaluate C: Liver synthesizes urea in the urea cycle to remove ammonia from blood.
• Identify D as non-liver function based on organ specialization.

Why D is correct:

• The liver produces bile for digestion but does not secrete digestive enzymes; this role belongs to the pancreas, which releases amylase, lipase, and proteases into the small intestine.

Why the others are wrong:

• A: Liver detoxifies alcohol through enzymatic breakdown in hepatocytes.
• B: Liver regulates glucose by breaking down stored glycogen during fasting.
• C: Liver forms urea from toxic ammonia in the ornithine cycle.

Final answer: D