Create an account
Function of --- and microvilli
Increase the surface area for absorption; brush border enzymes found on the surfaces of microvilli participate in chemical breakdown of carbohydrates and proteins; cell division within intestinal glands produces new cells that move up
absorption of ---
Absorption into epithelial cells: glucose and galactose - sodium symporter (secondary active transport); fructose - facilitated diffusion
Movement out of epithelial cell into bloodstream - by facilitated diffusion
Digestion of ---:
stomach - HCl denatures or unfolds proteins, pepsin turns proteins into peptides (smaller AA chains)
amino acids and dipeptides
absorption of --- & ---
Absorption into epithelial cells of duodenum and jejunum - active transport with Na+ or H+ ions (symporters)
Movement out of epithelial cell into blood - diffusion
Digestion of lipids small intestine
emulsification by bile from liver to form micelles
--- splits triglycerides into fatty acids and monoglyceride
no lipase enzymes in the brush border
Fat soluble vitamins
Absorption of lipids
- small fatty acids enter absorptive cells & then blood by simple diffusion
- larger lipids are sequestered within micelles after emulsification by bile; lipids enter cells by simple diffusion leaving bile salts behind in gut
-bile salts reabsorbed into blood & reformed into bile in the liver
---- (A K D E) are able to enter cells with the lipids
Absorption of Lipids
-Inside epithelial cells are fats and rebuilt and coated with protein to form ---
--- leave intestinal cells by exocytosis into a lacteal - travel in lymphatic system to reach subclavian veins -removed from the blood by the liver and fat tissue
Absorption of ---
sources: GI secretions, ingested foods and liquids
Enter epithelial cells by diffusion and secondary active transport
- sodium and potassium move by active transport
-chloride, iodide and nitrate follow passively
-iron, magnesium and phosphate ions use active transport
Intestinal Ca++ absorption requires vitamin D and parathyroid hormone
Absorption of ---
travel in micelles and are absorbed by simple diffusion with lipids
-water soluble --- absorbed by diffusion
B12 must combine with intrinsic factor from the stomach partietal cells before it is transported into the cells of the ileum - absorbed by receptor mediated endocytosis
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together