Final answer:
Fat is emulsified in the small intestine with the help of bile salts present in bile, produced by the liver and released by the gallbladder into the duodenum, where it aids in the efficient digestion of lipids.
Step-by-step explanation:
Fat is emulsified in the small intestine, specifically in the upper portion known as the duodenum. The liver secretes bile, which is stored in the gallbladder and released into the duodenum. Bile contains bile salts that emulsify large lipid globules into much smaller micelles. These micelles are then efficiently digested by pancreatic lipase, breaking down the lipids into fatty acids and glycerides. By emulsifying fats, bile significantly increases the surface area available for lipases to act upon, allowing for more efficient lipid digestion.