What is the primary digestive function of bile, and where is it produced and stored?

• A. Digest fats; produced by pancreas and stored in liver.
• B. Emulsifies fats; produced by gallbladder and stored in liver.
• C. Digest proteins; produced by stomach.
• D. Emulsifies fats; produced by liver and stored in gallbladder.

Answer: (D)

Bile’s main job in digestion is to emulsify fats, not to enzymatically digest them. Its detergent-like bile acids surround fat droplets, breaking them into much smaller droplets and increasing their surface area so pancreatic lipase can act more efficiently to break fats down into fatty acids and monoglycerides. Bile itself isn’t an enzyme; its emulsifying action is what prepares fats for digestion and absorption.

Bile is produced by the liver and stored in the gallbladder. When fatty chyme enters the small intestine, a signal causes the gallbladder to contract and release bile into the duodenum through the common bile duct.