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Vili - increase the surface area for chemical reactions
Bile - it is used for digestion
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Villi - To increase the surface area of the small intestine for the absorption of digested food .
HCL in stomach - The main function is to provide the necessary H+ for the activation of pepsinogen into pepsin
Bile - bile is digestive juice secreted by liver and stored in gall bladder and the function is to digest the food .
Mucus in stomach - it protects the inner lining of stomach form the highly acidic HCl .
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