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Villi: Their function is to increase the surface area of the small intestinal wall for absorption of the digested food. These projections absorb the protein molecules and help in the transfer of the protein to all cells and tissues...
HCI in the stomach: The main function of HCI is to provide the necessary H+ for the activation of pepsinogen into pepsin. Approximately 2 litres of HCI 8s secreted daily into our stomach. It also serves the purpose of protection by killing bacteria as well as harmful species by the high acidic environment...
Bile: The main function of Bile is, It aids in digestion, absorption, excretion, hormone metabolism and other functions. Bile juice is a digestive fluid produced by the liver. It is stored and concentrated in the gallbladder. It's main function is to convert fats in food into fatty acids, which are absorbed in the gut...
Mucus in the stomach: Mucus protects the linning of stomach from its own secretions of hydrochloric acid. Hydrochloric acid kills any bacteria which may enter the stomach with the food. It also makes the medium in the stomach acidic (which is necessary for proper action of digestive juices on proteins.)
Explanation:
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