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So, it's like this. We've got large intestines, and we've got small intestines. And the small intestines have, like, the duodenum, the jejunum, the ileum 'n' shit. Because the intestines act in absorption, it is important that they have a large surface area.

The body has several methods for naturally increasing the surface area (and thus ability to absorb) in the intestine. Some of these ways are:

  1. The convolutions and folds of the intestines in their placement in the abdomen.
  2. Plica circularis
  3. Villi
  4. Microvilli
  5. Glycocalyx

The base of the villus contains crypts of Leiberkuhn, beneath which lie more propria, strands of muscularis mucosa, and brunner's glands [1].

In the intestine, there are four types of surface epithelium cells:

  1. Goblet cell
  2. Entero-endocrine cell
  3. Paneth cell
  4. Absorptive cell

Immune function

The intestine's Peyer's patches are nodule-type tissues similar to lymph nodes in function, and also serve an immune function. Peyer's patches are most evident in the ileum [2].