Many digestive enzymes are produced in the pancreas and released into the duodenum. Why, then, has the mammalian stomach evolved the ability to produce pepsinogen?
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Many digestive enzymes are produced in the pancreas and released into the
duodenum. Why, then, has the mammalian stomach evolved the ability to
produce pepsinogen?
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- Food digestion occurs in much the same way in all vertebrates and many invertebrates. Which describes this common process?Can you help me with these questions? (A)Rank the test tubes in order of greatest amount of digestion to least amount of digestion. For each tube, explain why it would have exhibited that level of digestion. (B)How could the experiment be modified to further test human digestion actions? What variables would you change? What would you keep the same? (C)In which test tube was the activity most like that of a real human stomach? Explain. Here is the picture.Many digestive enzymes are synthesized in the pancreas and released into the duodenum. Why do mammalian digestive systems go to the trouble of producing pepsin in the stomach? What does pepsin do that others do not?
- While most of the digestive tract has two layers of muscle in the muscularis externa (longitudinal and circular), the stomach has a third oblique layer. Based on what you know about the role of the stomach in both mechanical and chemical digestion, why do you think the stomach has this third layer?Why is cellulolytic breakdown possible only among ruminants? What makes the ruminants’ digestion process unique compared with monogastric digestion?What is the specific role of pepsin and pancreatin in protein digestion? Where can these enzymes be found in the body?
- During the _____ phase of digestion, blood glucose levels drop and our body must depend on stored energy. The sympathetic nervous system directs the pancreas to release glucagon, which causes glycogen to be transformed back into glucose. Glucagon also causes stored fat and glycogen to be released into the bloodstream. A) fasting B) exhaustion C) resistenceSome animals, such as rabbits, whose digestive systems include hindgut fermentation, re-ingest the products of digestion. What function do you think this serves?Many species of hindgut fermenters, including horses, eat their feces to a greater extent when they have protein insufficiency than when they have plenty of protein. How might increased fecal consumption help?
- Why is it advantageous to the overall digestive process forsecretin and cholecystokinin to slow stomach emptying uponinitiation of the intestinal phase?why are Ruminants able to thrive even if they do not get all the essential nutrients in their diets, while mono-gastric animals are not so fortunate and will show signs of malnutrition if these nutrients are not in their feed?In humans, digestion occurs in all of the following locations EXCEPT: Stomach, Duodenum, Pancreas or Mouth Once absorbed in the enterocytes, free fatty acids and monoglycerides are linked together to form back triglycerides.True or False? Gastrulation is the process during embryonic development that changes the embryo from a blastula with a single layer of cells to a gastrula containing multiple layers of cells. True or False?