Q. 23 - Biology

Question

Explain how the villi and microvilli aid in absorption. 

Step-by-Step Solution

Answer

The small intestine's surface area is increased by villi and microvilli, which facilitate the absorption of bile salts and vitamin B12. Villi and microvilli enhance the small intestine's surface area, which improves nutrient absorption by diffusion.

Step 1: Introduction

Two different forms of protrusion, called villi and microvilli, can be seen on the inside surfaces of several organs. Both typically contribute to an increase in surface area.

Step 2: The explanation for the answer

1. The small intestine's surface area is increased by villi and microvilli, which facilitate the absorption of bile salts and vitamin B12. 
2. Villi and microvilli enhance the small intestine's surface area, which improves nutrient absorption by diffusion. 
3. The small intestine's villi and microvilli, which make up the inner layer of epithelial tissue, aid in the absorption of nutrients from chyme. 
4. The small intestine's villi and microvilli absorb food by peristalsis, a smooth muscle contraction.