Question

Vitamins ADEK, Calcium and Iron are absorbed primarily in the:

Group of answer choices

A. Colon

B. Terminal Ileum

C. Ileum

D. Dudoenum

E. Jejunum

Answer 1

The correct answer is (d) duodenum.
Small intestine is mainly responsible for the absorption of the fat soluble vitamins such as vitamins A,D,E,K and also minerals such as iron and calcium. The small intestine is divided into 3 parts ( duodenum, jejunum and ileum). All these substances are absorbed in the duodenum part of the small intestine.

The fat soluble vitamins are attached to mixed micelles with lipids and bile acids in the small intestine lumen and entry into the enterocytes is carried out by diffusion. This results in absorption of the fat soluble vitamins. Iron and calcium absorption is done with the help of various proteins.

Jejunum helps in absorption of sugars, proteins and fatty acids.

Ileum and terminal ileum help in the absorption of vitamin B 12 and bile salts.
Colon is a part of the large intestine and is mainly responsible for water absorption.