Briefly depict how carbohydrates, fats, and proteins are digested and absorbed. Start with the events that occur in the mouth and work your way through the gastrointestinal (GI) tract by explaining what happens to each macronutrient in the stomach, small intestine, and large intestine. Include the contributions of the liver, gallbladder, and pancreas to digestion, and be specific about which molecules are absorbed.

When a meal is put into the mouth, enzymes such as salivary amylase starts the digestion of Carbohydrates.

When the food is swallowed,Stomach enzymes containing pepsin and Hcl starts in the digestion of Protein.

The food then moves Into the duodenum which is a part of the small intestine. The protein is then again acted on by trypsin to form amino acid polypeptides.

Digestion of fats and oil starts here too and it is aided by bile which is produced by the liver and secreted by the gall bladder. Pancreatic juice which contains amylase and lipase acts on the starch and lipids respectively for further breakdown into glucose and glycerol respectively.

Nutrient and water reabsorption takes place in the large intestine the waste is expelled as faeces through the rectum.

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