- The mammalian small intestine is highly specialized for digestion and especially absorbtion
- Villi and microvilli increase absorbtive surface of small intestine
- Each villus contains a lacteal which is a terminal brach of the lymphatic system and is a terminal brach of the lymphatic system and is an important route for reabsorbtion of lipids and water.
- The surface of microvilli is covered with a meshwork of mucopolyaccharide and glycoprotein filaments, the glycocalyx
- This surface coat is extremely resistant to proteolytic and mucolytic agents, hence forms a protective surface.
- Many of important digestive enymes are absorbed into the glycocalyx meshwork, pancreatic amylase, disaccharases and dipeptidases.
- There are four basit mechanism for uptake of nutriends from the gut lumen and glycocalyx layer cytoplasm of the epithelial cells.
- Passive diffusion, Faciliated diffusion, Active transport, Pinocytosis
Small Intestine
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