Digestive enzymes in the gut include proteases, which digest proteins. Why don't these enzymes digest the stomach and small intestine, which are partially composed of protein?

the major parts of the digestive system:

salivary glands.

pharynx.

esophagus.

stomach.

small intestine.

large intestine.

rectum.

accessory digestive organs: liver, gallbladder, pancreas.

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im not intirely sure but i think the anwser is d relative humidity