absorption of digested lipids, monosaccharides and amino acids Flashcards
(10 cards)
What is the first step of lipid absorption?
Bile salts emulsify large droplets of lipids, increasing the rate of lipid hydrolysis.
What is the second step of lipid absorption?
Bile salts combine with fatty acids and monoglycerides to form micelles.
Why are micelles necessary?
They transport the poorly soluble monoglycerides and fatty acids across the epithelial cell surface.
What is the third step of lipid absorption?
The micelles break down next to the epithelial cell to release the fatty acids and monoglycerides.
Why can micelles break down next to the epithelial cell?
They can diffuse through the membrane of the epithelial cell.
What is the next step of lipid absorption after micelles?
Fatty acids, monoglycerides and glycerol are recombined in the smooth endoplasmic reticulum to form triglycerides.
What is the next step of lipid absorption after forming triglycerides?
Triglycerides are packaged in protein and phospholipids in the Golgi body to form chylomicrons.
What is the final step of lipid absorption?
Chylomicrons are absorbed into the lacteals in the villi which drain into the blood.
Where will there be a higher concentration of monosaccharides and amino acids?
In the lumen of the ileum.
How will monosaccharides and amino acids be absorbed?
Down a concentration gradient by facilitated diffusion.
