Why does the large intestine not contain villi and microvilli?

• A. Because it secretes digestive enzymes that do not require villi.
• B. Because it is responsible for the initial breakdown of food.
• C. Because its primary function is water absorption, not nutrient absorption.
• D. Because it is involved in the production of bile.

Answer: (C)

Verified step by step guidance

1. Understand the primary function of the large intestine: The large intestine is mainly responsible for absorbing water and electrolytes from the remaining indigestible food matter, and for forming and storing feces.
2. Recognize the role of villi and microvilli: Villi and microvilli are structures found in the small intestine that increase the surface area for nutrient absorption. They are crucial for absorbing nutrients from digested food.
3. Identify why the large intestine lacks villi and microvilli: Since the large intestine's primary function is water absorption rather than nutrient absorption, it does not require the increased surface area provided by villi and microvilli.
4. Consider the anatomical differences: The large intestine has a smoother inner surface compared to the small intestine, which is lined with villi and microvilli to maximize nutrient absorption.
5. Clarify the misconception: The large intestine does not secrete digestive enzymes nor is it involved in the initial breakdown of food or bile production. Its main role is to absorb water and electrolytes, which does not necessitate the presence of villi and microvilli.