As food leaves the stomach, gastric secretion is reduced. Which of the following factors does not contribute to this reduction?

Question

BlackTom AI · Accepted Answer

To analyze what reduces gastric secretion as chyme leaves the stomach, we should consider the enterogastric feedback mechanisms and duodenal/intestinal signals that slow gastric activity.
Option 1: Pepsinogen in the duodenum. This is not a key player in downregulating gastric secretion. Pepsinogen is a stomach-derived enzyme precursor; by the time chyme reaches the duodenum, pepsinogen is not a primary signal for inhibiting gastric secretion. Its presence in the duodenum does not contribute to the enterogastric inhibitory process, so this option is incorrect as a factor that reduces secretion.
Option 2: Fat in the duodenum. Dietary fat in the duodenum stimulates enterogastrones such as cholecystokinin (CCK) and gastric inhibitory peptide (GIP), which act to slow gastric emptying and suppress gastric acid and enzyme secretion. This effect clearly reduces gastric secretion, so fat in the duodenum is a contributing factor.
Option 3: High concentration of acid in the stomach or duodenum. Elevated acidity triggers reflexes and hormonal responses that inhibit gastric secretory activity, including feedback mechanisms that decrease acid production and enzyme secretion in the stomach. Therefore, high acidity contributes to reducing gastric secretion.
Option 4: Distension of the duodenum. Duodenal distension activates the enterogastric reflex, which decreases gastric motility and secretion. This distension is a well-known inhibitor of gastric activity, so it contributes to the reduction.
In summary, the factors that actively reduce gastric secretion include fat in the duodenum, high acidity in the tract, and duodenal distension via enterogastric feedback. The option involving pepsinogen in the duodenum does not participate in this inhibitory signaling, making it the one that does not contribute to the reduction.

As food leaves the stomach, gastric secretion is reduced. Which of the following factors does not contribute to this reduction?单项选择题

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