The food we eat is chewed in the mouth, is mixed with saliva and swallowed. It passes into the stomach where it is mixed with secretions of the stomach including Hydrochloric acid. The acid kills all harmful microorganisms and dissociates complex food particles in to simple particles.
The acidic food passes into small intestine where acidity is neutralized and food becomes alkaline. Food is mixed with secretions from pancreas and liver for further digestion. Liver secrets bile which has no enzymes. Bile is extremely important for the digestion of fats, without bile fats cannot be digested. Bile also prevents putrefaction of food.
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