Question

explain the digestion from duodenum to the ileum in detail

Answer 1

The ileum absorbs mainly vitamin B12, other water soluble vitamins, bile salts, and nutrients that were not absorbed in the jejunum. More specifically, the absorption of the vitamins takes place at the terminal ileum – the last part of the ileum. Removal of this portion of the ileum will necessitate supplementary vitamin B12 doses for rest of the life. The surface area of the ileum is very large to facilitate the adsorption and absorption process. The surface consists of many tiny finger-like segments that protrude outwards. These are termed villi and are covered with epithelial cells.

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