Why does stomach acid not damage the duodenum?
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Stomach DOES damage the small intestine - if it is not adequately neutralized.
Normally sodium bicarbonate is squirted into the beginning of the small intestine (along with some digestive enzymes) when food enters from the stomach. The bicarbonate usually adequately neutralizes the acid from the stomach, as well as establishes a proper "neutral" pH required by the enzymes that will function there.
BTW, it isn't so much the acid that can damage the small intestine as pepsin, the digestive enzyme from the stomach - causing peptic ulcers.
Also, BTW, the small intestine does not absorb blood!
Check again.
Normally sodium bicarbonate is squirted into the beginning of the small intestine (along with some digestive enzymes) when food enters from the stomach. The bicarbonate usually adequately neutralizes the acid from the stomach, as well as establishes a proper "neutral" pH required by the enzymes that will function there.
BTW, it isn't so much the acid that can damage the small intestine as pepsin, the digestive enzyme from the stomach - causing peptic ulcers.
Also, BTW, the small intestine does not absorb blood!
Check again.
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