In human, starch digestion begins in the buccal cavity, but stops in stomach. Why?

Amylase is not effective in highly acidic environment and the environment of stomach is highly acidic.

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because the enzymes required aren't present in the stomach.in the stomach only the enzymes pepsin(for protein digestion) &renin (in babies) is present.also small amount of lipases(for fat digestion is present).

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