Podcast
Questions and Answers
What role do stretch receptors and pH receptors play in the stomach?
What role do stretch receptors and pH receptors play in the stomach?
What happens to gastric secretion when the pH of the stomach drops below 2?
What happens to gastric secretion when the pH of the stomach drops below 2?
Which hormone is primarily involved in stimulating gastric juices during the presence of distended stomach and partially digested proteins?
Which hormone is primarily involved in stimulating gastric juices during the presence of distended stomach and partially digested proteins?
How do intestinal reflexes affect gastric digestion during the intestinal phase?
How do intestinal reflexes affect gastric digestion during the intestinal phase?
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What is the effect of cholecystokinin (CCK) on stomach activity?
What is the effect of cholecystokinin (CCK) on stomach activity?
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What initiates gastric secretion in response to food in the stomach?
What initiates gastric secretion in response to food in the stomach?
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What is the role of peristalsis in the stomach?
What is the role of peristalsis in the stomach?
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How does negative feedback affect gastric acid secretion?
How does negative feedback affect gastric acid secretion?
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What triggers the release of acetylcholine in the stomach?
What triggers the release of acetylcholine in the stomach?
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What initiates the intestinal phase of digestion?
What initiates the intestinal phase of digestion?
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Which item influences the secretion of secretin during the digestion phase?
Which item influences the secretion of secretin during the digestion phase?
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What is the effect of secretin on gastric activity?
What is the effect of secretin on gastric activity?
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What happens in the stomach as the pH reaches 2?
What happens in the stomach as the pH reaches 2?
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Study Notes
Stomach Function
- Stomach walls stretch when food enters, triggering gastric secretions to continue until food is gone.
- Stretch receptors and pH sensors regulate motility and acid secretion.
- Peristalsis moves 10-15 ml of chyme into the duodenum.
- Negative feedback inhibits acid secretion when pH reaches specific levels and the stomach lessens in volume.
Hormonal Control
- Partially digested proteins (acting as buffers) or stomach distension cause parasympathetic fibers to release acetylcholine.
- Acetylcholine stimulates G cells to release gastrin, which increases gastric juice production, strengthens the esophageal sphincter, and relaxes the pyloric sphincter.
- Gastrin release stops when the pH drops below 2.0, or when the stomach has less volume.
Intestinal Phase
- Chyme entering the small intestine triggers reflexes to slow down gastric digestion.
- Preventing large chyme flows to the duodenum.
- Chyme's carbohydrates and fatty acids stimulate secretin and cholecystokinin (CCK) release.
- Secretin stops gastric secretion, and CCK inhibits stomach emptying.
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Description
Test your knowledge about the functions of the stomach and the hormonal control during digestion. This quiz covers aspects such as gastric secretions, motility regulation, and the intestinal phase of digestion. Perfect for students studying human physiology or related subjects.
