Question

Digestion of protein is completed in which part of small intestine ______

• A. Duodenum
• B. Ileum
• C. Duodenum and ileum
• D. Stomach

Answer 1

The correct option is B

Ileum

The correct option is B.
Explanation for correct option:

1. Digestion of protein is completed in ileum.
2. Digestion helps in breakdown of proteins so that they can be utilised in the metabolism of the body proteins are essential for for our body growth and maintenance.
3. Protein starts to break down in the stomach.
4. Absorption of protein starts in duodenum which breakdowns protein into smaller forms called amino acids and these amino acids are finally absorbed by ileum and then they are used by different parts of the body via blood.

Explantation for incorrect options

Option A:

1. In duodenum, enzymes from digestive juice perform the breakdown of large protein molecules into small molecules called amino acids.
2. So digestion of proteins is not completed in duodenum.

Option C:

1. 1.In duodenum, breakdown of complex molecules of proteins takes place and in ileum the complete absorption of protein takes place.
2. That's why digestion of protein is completed only in ileum.

Option D:

1. In stomach breakdown of protein begins
2. .Protein digestion occurs within the stomach by the action of hydrochloric acid and an enzyme pepsin.

Final answer: Digestion of protein is completed in ileum.