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. Your description can either be a series of 3 flowcharts or a compare/contrast table that track the basic digestion of macronutrients.

Digestion is the breakdown of food substances into smaller units which will later be absorbed and used for the body metabolism.

When food is taken in, the carbohydrate is acted upon by salivary amylase and carbohydrate is broken down.

The food enters the stomach and the protein is acted upon by pepsin and dilute Hydrochloric acid to break it into smaller peptides.

The food(chyme)then enters into the small intestine through the duodenum. Before entering the small intestine the food is mixed with pancreatic juice from the pancreas and bile from the liver. The gall bladder stores the bile and mixes the food with it.

In the small intestine the pancreatic amylase, protease and lipase finally acts on carbohydrates, protein and fat and oil. Glucose, Amino acid and fatty acid is formed as the end product of the digestion of these three classes of food.

The large intestine absorbs and reabsorbs nutrient and they are channeled into the bloodstream through the villi.

The waste is expelled through the rectum.

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