Question

question 25
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which structure closes when the enterogastric reflex is activated?
duodenum
pyloric sphincter
mucosal barrier
fundus

Explanation:

The enterogastric reflex is a physiological response. When activated, it inhibits gastric emptying. The pyloric sphincter is the structure that controls the passage of chyme from the stomach to the duodenum. Activation of the enterogastric reflex causes the pyloric sphincter to close, preventing further emptying of the stomach contents into the small intestine. The duodenum is a part of the small intestine (not a closing structure in this context), the mucosal barrier protects the stomach lining, and the fundus is a part of the stomach involved in storage (not directly related to closing in this reflex).

Answer:

B. Pyloric sphincter