Question

The reflex in which there is inhibition of gastric emptying when there is acid and a hypertonic solution in the duodenum is?

• A. Enterogastric reflex
• B. Gastroileal reflex
• C. Gastrocolic reflex
• D. Myenteric reflex

Hint:

Name the reflex that runs from the duodenum back to the stomach to slow it down.

Answer 1

The Correct Option is A

Decode the name and the answer falls out: entero (intestine) gastric (stomach) means the signal starts in the intestine and acts on the stomach. So when duodenal contents turn acidic or hypertonic, the enterogastric reflex tells the stomach to slow its emptying, which is option (a).
This is a protective brake. The duodenum can only neutralize and process so much chyme at a time, so the reflex throttles gastric output in response to acid (pH near 3-4), hypertonicity, fat, and protein digestion products. Contrast the distractors: gastroileal opens the ileocecal traffic when the stomach fills, gastrocolic produces the urge to defecate after a meal, and the myenteric reflex is the basic local wall reflex coordinating peristalsis. Only the enterogastric reflex matches inhibition of gastric emptying driven by duodenal acid and hypertonic solution.
Ref: Gastrointestinal physiology, gastric emptying regulation.