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Which of the following food substances is digested in the stomach?


Question

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

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 emulsifier of lipids. This breaks the large fat droplets into smaller droplets that are then easier for the fat-digesting enzyme pancreatic lipase to digest.


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Dicussion (1)

  • 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 emulsifier of lipids. This breaks the large fat droplets into smaller droplets that are then easier for the fat-digesting enzyme pancreatic lipase to digest.

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