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Biology

How does your stomach avoid digesting itself?

Quick fact

Stomach acid (hydrochloric acid) has a pH as low as 1.5, but the stomach lining secretes a thick bicarbonate-rich mucus that protects the tissue from digestion.

Why this is interesting

Your stomach produces acid powerful enough to eat through steel, yet it doesn't consume itself—thanks to a microscopic layer of mucus that's constantly being rebuilt.