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Physio II
Lab quiz 2-Large Intestines, Fat digestion, & Gi hormones
| Question | Answer |
|---|---|
| What is the size of the large intestine | 5 feet and 2.5 inches in diameter |
| define haustrations | segmental contractions |
| define gastrocolic reflex | mass movements triggered by filling of the stomach |
| How is access to the large intestine controlled | ileocecal valve |
| what casues relaxation of the ileocecal valve | distention of the terminal ileum |
| How long does passage through the colon take | 16-24 hours |
| When are lipids absorbed | not until the lower part of the ileum |
| What types of fats are found in the diet | triglycerides (90-95%) cholesterol and lecithins |
| How are triglycerides broken down | by pancreatic lipase, and alpha-esterase which hydrolyzes ester bond leaving FFA and 2-monoglyceride |
| How are cholesterols digested | the ester is hydrolyzed by pancreatic cholesterolester hydrolase |
| How are lecithins digested | lingual lipase |
| What is the role of bile in fat digestion | bile salts with lecithins and FFA promote emulsification of fat into very small droplets--> increase surface area--> lipase bound on droplet surface to displace from oil-H2O interphase |
| How are micelles loaded | by colipase |
| where are conjugated bile acids absorbed | terminal ileum |
| where are unconjugated bile acids absorbed | throughout the SI |
| How are fat soluble vitamins absorbed | by micelles in the chylomicron pathway |
| what causes white stools (steatorrhea) | missing bile enzymes |
| Why did the pH decrease in tubes 2,3 | triglycerides were digested to produce FFAs...acids! |
| Why was there no change in pH in tube 1 | bc there was no lipase which is needed for fat digestion |
| How can the number of unsaturations be determined | using iodine as a reagent |
| What is the iodine number | the amount of iodine reacting with the double bonds |
| Which have higher iodine numbers animal or vegetable fats | vegetable |
| what is the exception to the rule concerning iodine number and vegetable oils | coconut oil |
| What are the 3 FAs most commonly present in triglycerides and are saturated | stearic acid, oleic acid, palmitic acid |
| What lipid is primarily used for metabolism | triglycerides |
| What is a chylomicron | triclycerides + apoprotein B made inside cells in SI and passed to lacteal |
| What is the primary fxn of the liver in lipid metab | to make triglycerides and lipoproteins |
| What is the stimulus for mass movements in the colon | gastrocolic and duodenocolic reflexes and gastrin |
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sparklefarkle84
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