What do you mean by regional differentiation of gut.

Explanation

### Step-by-Step Text Solution:

1. **Definition of Regional Differentiation of Gut**:
- Regional differentiation of the gut refers to the specialization of different sections of the digestive tract, particularly the small intestine, to perform distinct functions in the digestive process.

2. **Structure of the Small Intestine**:
- The small intestine is divided into three main parts:
- **Duodenum**: The first section, which is primarily responsible for the initial phase of digestion. It receives chyme from the stomach and secretions from the pancreas and liver, aiding in the breakdown of food.
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