Vitamin B12

Vitamin B12 -...

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Vitamin B 12 : Vitamin B 12 combines with intrinsic factor (produced in the  stomach) and is absorbed by receptor-mediated endocytosis. It is then passed to the  blood capillaries.  Lipids and fat-soluble vitamins: Because fat-soluble vitamins and the  components of lipids are insoluble in water, they are packaged and delivered to cells  within water-soluble clusters of bile salts called micelles. They are then absorbed by  simple diffusion and, once inside the cells, mix with cholesterol and protein to form  chylomicrons.  The chylomicrons are then passed to the lymphatic capillaries. When  the lymph eventually empties into the blood, the chylomicrons are broken down by  lipoprotein lipase, and the breakdown products, fatty acids and glycerol, pass through  blood capillary walls to be absorbed by various cells.  Water and electrolytes: About 90 percent of the water in chyme is absorbed, 
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This note was uploaded on 11/10/2011 for the course PT 101 taught by Professor Staff during the Spring '10 term at Texas State.

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