No, a villus is not a gland.
Villi and glands (specifically intestinal glands, also known as crypts of Lieberkühn) are both structures found in the small intestine, but they serve different purposes and have distinct structures. Villi are finger-like projections that increase the surface area for absorption of nutrients. Intestinal glands, on the other hand, are invaginations or pits located between the villi that contain cells responsible for secreting intestinal juices, hormones, and other substances aiding in digestion.
Here's a comparison:
| Feature | Villi | Intestinal Glands (Crypts of Lieberkühn) |
|---|---|---|
| Function | Increase surface area for nutrient absorption | Secrete intestinal juices, hormones, and other substances |
| Structure | Finger-like projections | Invaginations/Pits between villi |
| Cell Types | Enterocytes (absorptive cells), goblet cells | Various secretory cells (e.g., goblet cells, Paneth cells) |
| Location | Projecting into the lumen of the intestine | Located within the intestinal wall, between villi |
In summary, villi maximize nutrient absorption, while intestinal glands contribute to the digestive process through secretion. They are distinct but complementary structures within the intestinal lining.
