Question

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which situation could cause someone to experience gastroesophageal reflux disease (gerd)?
the lower esophageal sphincter becomes weak and does not close properly.
the immune system starts to damage the small intestine.
the stomach does not release gastrin.
the large intestine cannot break down fiber.

Explanation:

Gastroesophageal reflux disease (GERD) occurs when stomach acid flows back into the esophagus. The lower esophageal sphincter (LES) normally prevents this by closing properly. If the LES is weak and doesn't close properly, acid can reflux, causing GERD. The other options relate to different issues: immune system damaging the small intestine is like celiac disease, stomach not releasing gastrin affects acid production differently, and the large intestine not breaking down fiber is a normal aspect of digestion (as the large intestine doesn't break down fiber, it's fermented by gut bacteria).

Answer:

The lower esophageal sphincter becomes weak and does not close properly.