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31 Cards in this Set
- Front
- Back
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Intestinal enzymes such as lactase are: a) secreted by the intestine into the chyme b) produced by the intestinal crypts (of Lieberkuhn) c) produced by the pancreas d) attached to the cell membrane of microvilli in the epithelial cells of the mucosa |
d) attached to the cell membrane of microvilli in the epithelial cells of the mucosa |
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Which of these statements about gastric secretion of HCl is FALSE? a) HCl is secreted by parietal cells b) HCl hydrolyzes peptide bonds c) HCl is needed for the conversion of pepsinogen to pepsin d) HCl is need for maximum activity of pepsin |
b) HCl hydrolyzes peptide bonds |
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Most digestion occurs in: a) the mouth b) the stomach c) the small intestine d) the large intestine |
c) the small intestine |
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Which of these statements about trypsin is TRUE? a) Trypsin is derived from trypsinogen by the digestive action of pepsin b) Active trypsin is secreted into the pancreatic acini c) Trypsin is produced in the crypts (of Lieberkuhn) d) Trypsinogen is converted to trypsin by the brush border enzyme enterokinase |
d) Trypsinogen is converted to trypsin by the brush border enzyme enterokinase |
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During the gastric phase, the secreation of HCl and pepsinogen is stimulated by: a) vagus nerve stimulation that originates in the brain b) polypeptide in the gastric lumen and by gastrin secretion c) secretin and cholecystokinin from the duodenum d) all of these |
b) polypeptide in the gastric lumen and by gastrin secretion |
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The secretion of HCl by the stomach muscosa is inhibited by: a) neutral reflexes from the duodenum b) the secretion of an enterogastrone from the duodenum c) the lowering of gastric pH d) all of these |
d) all of these |
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The first organ to receive the bloodborne products of digestion is a) the liver b) the pancreas c) the heart d) the brain |
a) the liver |
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Which of these statements about hepatic portal blood is TRUE? a) It contains absorbed fat b) It contains ingested proteins c) It is mixed with bile in the liver d) It is mixed with blood from the hepatic artery in the liver |
d) It is mixed with blood from the hepatic artery in the liver |
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Absorption of salt and water is the principal function of which region of the GI tract? a) Esophagus b) Stomach c) Duodenum d) Jejunum e) Large intestine |
e) Large intestine |
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Cholecystokinin (CCK) is a hormone that stimulates: a) bile production b) release of pancreatic enzymes c) contraction of gallbladder d) both a and b e) both b and c |
e) both b and c |
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Which of these statements about starch digestion is FALSE? a) It begins in the mouth b) It occurs in the stomach c) It requires the action of pancreatic amylase d) It requires brush border enzymes for completion |
b) It occurs in the stomach |
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Which of these statements about fat digestion and absorption is FALSE? a) Emulsification by bile salts increases the rate of digestion b) Triglycerides are hydrolyzed by the action of pancreatic lipase c) Triglycerides are resynthesized from monoglycerides and fatty acids in the intestinal epithelial cells d) Triglycerides, as particles called chylomicrons, are absorbed into blood capillaries within the villi |
d) Triglycerides, as particles called chylomicrons, are absorbed into blood capillaries within the villi |
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Which of the following hormones stimulates the secretion of histamine from the ECL cells? a) Enterogastrone b) Gastrin c) Secretin d) Cholecystokinin |
b) Gastrin |
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Which of the following food types is most effective at provoking the intestinal phase of gastric regulation? a) Fat b) Starch c) Sugars d) Proteins e) Amino Acids |
a) Fat |
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Which of the following statements about the liver is FALSE? a) Its cells cannot regenerate when damaged b) It is the first organ to receive food molecules from the intestine c) Its cells are in direct contact with the blood d) Arterial and venous bloods mix as they travel through the sinusoids e) The liver produces the bile acids and the bile pigment |
a) Its cells cannot regenerate when damaged |
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Place these layers of the GI tract in order from outside to inside. a) Mucosa b) Serosa c) Muscularis externa d) Submuscosa |
Serosa Muscularis externa Submucosa Muscosa |
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How much saliva do we prodcue in a day? |
1-2 Liters/day |
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They is no absorption done in the mouth. True or false? |
True |
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What is the name of the mechanical digestion done in the mouth? |
Mastication |
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In which organ does protein digestion begin? |
Stomach |
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What do we have to revent acid reflux? |
Gastroesophageal sphincter |
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What is aborbed in the stomach? |
Alcohol Water Aspirin |
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What do goblet cells secrete? |
Mucus |
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What do cheif cells secrete? |
Pepsinogen |
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In what area of the digestive system does the lumen first contain feces? |
Large intestine |
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What are the 5 functions of the liver? |
Bile production adn secreton Detoxification of blood House macrophages Store glycogen, fat, iron and fat-soluble vitamins Synthesize plasma proteins |
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Where is bile made? Where is bile stored? |
Made in the liver Stored in the gallbladder |
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What is the name of the inactive enzymes released in th pancreas? |
zymogens |
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What are the 3 phases of the gastric function? |
Cephallic phase Gastric Phase Intestinal phase |
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Which hormones stimulate bile release? |
Secretin CCK |
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Fats are released into the blood. True or False? Explain |
False they are released into the lymph |
