Animal nutrition practice questions MNF.pdf

2 predict what would happen to water reabsorption in

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2. Predict what would happen to water reabsorption in the large intestine if you inhibited the Na/K ATPase on intestinal cells. Justify your answer. 3. Predict how changes in osmolarity in the gut could affect water reabsorption and cause diarrhea or constipation. 4. **Sorbitol is a sugar substitute that tastes sweet but that cannot be absorbed by the small intestine. Eating large amounts of “sugar free” candy or gum containing sorbitol can cause diarrhea. Propose a mechanism to explain this side effect of sorbitol consumption. 3
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Animal Nutrition Practice questions Organized by learning goal. Learning Objective 9: Explain how saliva secretion is regulated 1. Outline the role of the parasympathetic nervous system in the regulation of saliva secretion. 2. *There are a variety of drugs that can be used to suppress the activity of the sympathetic nervous system. How might these drugs affect the production of saliva? Explain your answer. 3. How is the hypothalamus involved in the regulation of saliva secretion? Learning Objective 10: Explain how stomach acid secretion is regulated 1. What stimuli control acid secretion in the stomach? 2. Compare and contrast the roles of gastrin and somatostatin in the regulation of stomach acid secretion. 3. How would taking an antacid tablet (which contains chemicals that reduce the acidity of the stomach) affect the secretion of somatostatin? How would this affect the secretion of HCl from the parietal cells? 4. *If you took a histamine-booster, how might that affect acid production in the stomach during a meal? 5. * Patients with tumours in the gastrin secreting cells of the stomach sometimes have uncontrolled gastrin secretion and thus high levels of circulating gastrin in the blood. These tumours can lead to stomach ulcers (a break or sore in the lining of the stomach that does not heal). Explain why these tumours might cause ulcers. 6. *The graph below shows stomach pH in a human. On the graph, indicate when you think gastrin levels in the blood will be greatest. Justify your answer. Learning Objective 11: Compare the regulation of digestion and absorption in animals with different feeding modes. 1. ***Animals such as pythons (a type of very large snake) eat very large meals, and eat very infrequently. Pythons allow their small intestine to regress (become smaller and less active) between meals. Suggest a hypothesis to explain why this occurs. Would you predict this would happen in snake species that eat more frequently? Justify your answer. 4
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