Lipid Digestion & Absorption

These flashcards cover key concepts related to lipid digestion and absorption, designed to aid in exam preparation.

What are lipids composed of?

Lipids are heterogeneous compounds of water insoluble (hydrophobic) organic molecules.

What percentage of ingested lipids are triglycerides?

90% of ingested lipids are triglycerides (TAGs).

What is emulsification in the context of lipid digestion?

Emulsification is the breakdown of large fat globules into small molecules to increase the surface area for pancreatic lipase action.

Which enzyme is the most active in lipid digestion?

Pancreatic lipase is the most active enzyme in the digestion of triglycerides.

What is the fate of beta-monoglycerides during lipid absorption?

72% of beta-monoglycerides are absorbed as such with the help of bile salts.

What products are formed from the digestion of cholesterol esters?

Free cholesterol and free fatty acids are formed from cholesterol esters.

What are the end products of lipid digestion?

The end products are beta-monoglycerides, alpha-monoglycerides, free fatty acids, glycerol, cholesterol, and lysophospholipids.

How do bile salts aid in the absorption of lipids?

Bile salts surround lipid components to form water-soluble micelles that enter enterocytes by endocytosis.

What role does intestinal lipase play in lipid metabolism?

Intestinal lipase hydrolyzes alpha-monoglycerides into glycerol and free fatty acids.

What is the significance of chylomicrons in lipid transport?

Chylomicrons transport water-insoluble lipids from the intestinal mucosa through the lymphatic system into the bloodstream.