The villi and the ileum are both important components of the small intestine, but they have distinct structures and functions. Here's a breakdown of their differences:
Villi vs. Ileum: Key Differences
| Feature | Villi | Ileum |
|---|---|---|
| Definition | Microscopic, finger-like projections. | The last section of the small intestine. |
| Location | Found lining the inner wall of the small intestine (specifically, they are abundant in the jejunum). | Located between the jejunum (the middle section of the small intestine) and the large intestine. |
| Function | Increase the surface area for absorption of digested nutrients. | Absorbs remaining nutrients, vitamin B12, and bile salts. Connects the small and large intestines. |
| Structure | Small, finger-like protrusions containing blood capillaries and lacteals. | A tubular organ approximately 3 meters long in adults with distinct layers of tissue. It connects to the cecum (the beginning of the large intestine). |
Detailed Explanation
Villi
The primary function of the villi is to increase the surface area available for nutrient absorption in the small intestine. The reference states "The villi help in the absorption of all the digested products, present in the jejunum." They are especially abundant in the jejunum, the section of the small intestine before the ileum.
Ileum
The ileum is the terminal section of the small intestine. The reference mentions "The ileum is the last part of the small intestine. It ends in the large intestine. Ileum plays an important role in absorbing the remaining nutrients, vitamins like vitamin B12 and bile salts." This segment is crucial for absorbing nutrients that were not absorbed earlier in the digestive process, including vitamin B12 and bile salts, which are important for fat digestion. The ileum connects the small intestine to the large intestine.
