Why doesn't stomach acid burn through our stomachs?
SMRTR summary
The human stomach produces highly corrosive acid to break down food and kill harmful bacteria, yet doesn't burn itself because specialized cells create a thick, alkaline mucus barrier that continuously protects the stomach lining. When this protective layer becomes damaged by factors like overuse of pain medications, smoking, or bacterial infections, acid can penetrate and cause painful ulcers.
SMRTR provides this summary for quick context. The original article belongs to Live Science.
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