Lipase: which description best matches its role in digestion?

Lipase: which description best matches its role in digestion?

• A. Breaks down proteins
• B. Breaks down fat with the help of bile
• C. Breaks down carbohydrates
• D. Neutralizes stomach acid

Answer: (B)

Fat digestion hinges on lipase attacking triglycerides and converting them into fatty acids and monoglycerides. This enzyme works best in the small intestine where fats are already emulsified by bile. Bile salts break large fat droplets into tiny ones, increasing the surface area available for lipase to act. With this increased surface, pancreatic lipase can hydrolyze the triglycerides more efficiently, and the products form micelles that transport them to the intestinal lining for absorption. That’s why the description of lipase as breaking down fat with the help of bile is the most accurate. It isn’t responsible for breaking down proteins or carbohydrates—that’s done by proteases and amylases, respectively—and it doesn’t neutralize stomach acid, which is handled by bicarbonate and other intestinal secretions.

Fat digestion hinges on lipase attacking triglycerides and converting them into fatty acids and monoglycerides. This enzyme works best in the small intestine where fats are already emulsified by bile. Bile salts break large fat droplets into tiny ones, increasing the surface area available for lipase to act. With this increased surface, pancreatic lipase can hydrolyze the triglycerides more efficiently, and the products form micelles that transport them to the intestinal lining for absorption. That’s why the description of lipase as breaking down fat with the help of bile is the most accurate. It isn’t responsible for breaking down proteins or carbohydrates—that’s done by proteases and amylases, respectively—and it doesn’t neutralize stomach acid, which is handled by bicarbonate and other intestinal secretions.