Question

Of the following layers, which one forms rugae in the stomach and villi in the intestine of humans?

A. Serosa B. Sub-mucosa C. Mucosa D. Muscularis

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Answer

To determine which layer forms the rugae in the stomach and villi in the intestine of humans, let's understand the structure and function of the different layers of the gastrointestinal tract:

  1. Serosa: The outermost layer, comprising epithelial cells and some connective tissues.
  2. Muscularis: This layer is responsible for the movement and consists of three types of muscle layers: longitudinal, circular, and oblique.
  3. Sub-mucosa: It lies beneath the mucosa and contains connective tissue, blood vessels, and nerves.
  4. Mucosa: The innermost layer, responsible for secretion and absorption.

The mucosa layer is crucial because it:

  • Secretes enzymes and other digestive juices.
  • Absorbs nutrients.

Specifically:

  • In the stomach, the mucosa forms folds known as rugae. These folds allow the stomach to expand when it's full and increase the surface area for digestion.
  • In the intestine, the mucosa forms villi and microvilli, which are finger-like projections. These structures significantly increase the surface area for nutrient absorption.

Therefore, the correct answer is:

C. Mucosa


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