Select which is not true of intestinal villi among these.

Options

A. They possess microvilli
B. They increase surface area
C. They are supplied with capillaries and lacteal vessels
D. They only participate in digestion of fats

Answer

To determine which statement about intestinal villi is not true, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Intestinal Villi**:
- Intestinal villi are small, finger-like projections that line the inner wall of the small intestine. They play a crucial role in the absorption of nutrients.

2. **Evaluating the First Statement**:
- **Statement**: "They possess microvilli."
- **Analysis**: This statement is true. Microvilli are tiny projections on the surface of the villi that increase the surface area for absorption.

3. **Evaluating the Second Statement**:
- **Statement**: "They increase the surface area for absorption."
- **Analysis**: This statement is also true. The presence of microvilli on the villi significantly enhances the surface area, facilitating better nutrient absorption.

4. **Evaluating the Third Statement**:
- **Statement**: "They are supplied with capillaries and lacteal vessels."
- **Analysis**: This statement is true as well. Villi contain blood capillaries and lacteals (lymphatic vessels) that help in the transport of absorbed nutrients and fats.

5. **Evaluating the Fourth Statement**:
- **Statement**: "They only participate in the digestion of fats."
- **Analysis**: This statement is false. Intestinal villi do not participate in digestion; instead, they are primarily involved in the absorption of nutrients, including fats and other food materials. Therefore, this statement is not true.

### Conclusion:
The statement that is not true about intestinal villi is: **"They only participate in the digestion of fats."**