Before coming to school one day, you stop at McDonald\'s and purchase a Sausage

Question

Before coming to school one day, you stop at McDonald's and purchase a Sausage Biscuit. After eating this delicious breakfast sandwich (and belching several times), your mind wanders back to physiology and the riveting lessons on the chemical breakdown of foodstuffs. The following questions come to mind.

1.) What was the predominant food molecule in each part of the sandwich?

2.) Where in the digestive tract is each part of the sandwich chemically digested?

3.) What are the main enzyme(s) and/or secretion(s) involved with digesting each part of the sandwich?

Remember, some food molecules are broken down in more than one place in the body. Answer the three questions above for the biscuit, the sausage (assume it's very lean), and the butter on the biscuit.

Be sure to organize your answer in an easy to understand manner, such as a table, separate paragraphs, ordered lists, etc. Confusing lists of words or long run-on paragraphs that attempt to answer the question will receive no points.

Explanation / Answer

Sausage contains fats and proteins while biscuit contains sugars i.e. carbohydrates and butter on the biscuit contains fats.

1. Carbohydrates digestion starts from the mouth requires amylase enzyme from saliva and then it takes place in the small intestine(needs pancreatic amylase and brush border enzymes).

2. Fats digestion starts from our mouth by lingual lipase enzyme in saliva, Bile from liver emulsifies the fat and pancreatic amylase both act on fats in the small intestine.

3. Protein digestion takes place in the stomach by an enzyme known as pepsin then in the small intestine, we have pancreatic enzymes - trypsin, chymotrypsin, and carboxypeptidase which also play important role in protein digestion in the small intestine.

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