Duodenum's role in fat digestion

Steps:

• Identify the duodenum as the first part of the small intestine where most chemical digestion occurs.
• Recall that pancreatic enzymes, including lipase, are released into the duodenum via the pancreatic duct.
• Note that lipase specifically breaks down fats into fatty acids and glycerol in this alkaline environment.
• Eliminate options unrelated to duodenal functions like bile production or pH adjustment.

Why C is correct:

• Lipase from pancreatic juice digests triglycerides into monoglycerides and free fatty acids in the duodenum, as per enzymatic hydrolysis in the small intestine.

Why the others are wrong:

• A: Bile is produced in the liver and stored in the gallbladder, not formed in the duodenum.
• B: Faeces formation occurs in the large intestine through water absorption, not the duodenum.
• D: Pancreatic juice is alkaline and raises duodenal pH to neutralize stomach acid, rather than lowering it.

Final answer: C