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Intestinal Absorption #2 HTML5

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Summary

The absorption of nutrients from the small intestine is facilitated by a large exchange surface with the contents of the intestine (chyle). The folds of the intestinal wall, the villi and microvilli result in an area of approximately 200 m2.

Nutrients, small soluble molecules from digestion, pass through the intestinal cells (enterocytes) of the intestinal wall and into the blood or lymph according to their nature (carbohydrates, proteins, lipids). They are then transported to all body cells.

Click to see the absorption at the level of intestinal cells.

Learning goals

  • To illustrate how to trace the absorption of nutrients through the intestinal cells.
  • To address different absorption mechanisms depending on the nature of the nutrients (carbohydrates, proteins, lipids).

Keywords

Learn more

Intestinal cells (enterocytes) have two poles:

  • the apical pole is found on the side of the intestinal contents. The plasma membrane forms folds called microvilli or brush border.
  • the basal…

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