Please enable JavaScript.
Coggle requires JavaScript to display documents.
Absorption and Digestion - Coggle Diagram
Absorption and Digestion
Absorption
In mammals once the process of digestion has occured, the products are absorbed by the cells lining the ileum
The ileum wall is covered in villi, which have thin walls that are surrounded by a network of capillaries and epitherlial cells which have even smaller microvilli
-
-
Cotransport
Used to absorb glucose and amino acids from the lumen to the gut, there must be a higher concentration in the lumen compared to the epithelial cell (facilitated diffusion)
Lipid Absorption
-
3.) As the micelle enters the ileum epithelial cells they simply diffuse across the cell membrane, this is because of the non-polar nature of the fatty acids and the monoglycerides
-
4.) Once in the cell the micelles will be reformed back into triglycerides inside the endoplasmic reticulum
-
5.) The transformed triglycerides travel via the Golgi vesicles to the Golgi body where cholesterol and proteins are synthesised to form Chylomicrons
6.) Chylomicrons move out of the cell via exocytosis. They enter lymphatic capillaries called lacteals that are found in the center of villi and enter the bloodstream
-
Digestion (lipids)
-
Lipase is produced in the pancreas, it can hydrolyse the ester bonds in triglycerides to form monoglycerides
Bile salts are produced in the liver and can emulsify lipids to form tiny droplets known as micelles; these are used to increase the surface area for lipids to act on
Bile salts are made in the liver, stored in the gall bladder - travels through the 'Bile ducts' into the small intestine (Duodenum)
-
Micelles
-
-
Micelles deliver fatty acids, glycerol and monoglycerides
Water soluble vesicles formed from fatty acids, glycerol monoglycerides andbile salts
-
