Bio2 Lecture 15

Bio2 Lecture 15 - Bio2 Lecture 15 3/10/05 Missed....

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Bio2 Lecture 15 3/10/05 Missed…… Absorption Transportation ….. Lipids… Lipids - Digested, combined with bile salts and formed into miscelles - You are making the lipids smaller - Lipids leave the miscelles diffuse across membranes into the epithelial cells - Endoplasmic reticulum of epithelial cells produce proteins that coat lipid (chylomicrons) - This is repackaging into triglycerides, this is done by adding protein on the outside and these are the chylomicrons, cholesterol also part of chylomicrons - Chylomicrons – will go to the lacteals or lymph vessels, and release their contents by exocytosis. Exocytosis from epithelial cells into lacteals, lymph system to blood stream (circulatory system) - Polysaccharide which is a carbohydrate, it is digested into a disaccharide by amylase which came from pancreas, and we get monosaccharides by hydrolysis, then we have maltose hydrolisized to fructose or glucose, so it is actively transported because it is a large molecule, and transported to epithelial cells then to veins through simple diffusion - Proteins are first digested in the stomach, then digestion ends in the duodenum and the amino acids need to be transported to epithelial cells then into capillaries. Whats left moves into large intestines - We are not efficient creatures, otherwise we’d only have to eat one meal a day - Undigested protein, fats, and carbohydrates move into large intestine or colon - Escending colon, transverse, descending, and - Undigestable materials: o Cellulose o Water (absorbed) o Dead cells o Bacteria
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Beneficial bacteria live in the colon - Produce certain vitamins, k vitamin and B12 - They get the nutrients from undigested food - The vitamins they make, we use Elimination - How do we get rid of undigested waste, this is digested waste, not metabolic waste, it forms feces (digestive waste) - 75% is water (varies) - 25% solid o 30% dead bacteria o 70% cellulose, undigested food, dead cells and some bile - What happens if water is not absorbed, then you have diarrhea which causes dehydration, opposite is constipation, should eat fiber to prevent this. If you don’t
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This note was uploaded on 08/10/2009 for the course BIO 102 taught by Professor Brey during the Spring '08 term at Rutgers.

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Bio2 Lecture 15 - Bio2 Lecture 15 3/10/05 Missed....

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