Question 1 Which of the following food substances is digested in the stomach? Options A) Carbohydrate B) Fats and oil C) Fats and proteins D) Proteins E) Carbohydrates and fats Suggested Lesson: Digestive System | Human Biology The correct answer is D. Explanation: Protein digestion occurs in the stomach and duodenum in which 3 main enzymes, pepsin secreted by the stomach, trypsin and chymotrypsin secreted by the pancreas, break down food proteins into polypeptides that are then broken down by various exopeptidases and dipeptidases into amino acids. Carbohydrate digestion begins in the mouth with the mechanical action of chewing and the chemical action of salivary amylase. Carbohydrates are not chemically broken down in the stomach, but rather in the small intestine. Lipids, or fat on the other hand, go undigested in your digestive tract until they reach your small intestine, where they meet bile. Bile contains bile salts, which act as an emulsi
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