How is the villus the functional unit of the small intestine?
What is the importance of the surface area to the functioning villi?
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The Digestion System
Question: How is the villus the functional unit of the small intestine?
Response: The lumenal surface of the small intestine is composed of fingerlike projections in the mucosa. These projections are called villi. They are 0.5 - 1 mm long and because of their large number (20-40 per square mm), they vastly increase the surface area of the epithelium. This enhances the absorption and digestive capacity of the small intestine. Essentially, the repeating unit of the small intestine is the villus. Everything required for digestion and absorption is found in the villus -- lymphatic lacteal, blood capillaries, secretory cells, absorptive cells, etc.
Question: What is the structure and function and the enzymes found there.
Response: The ...