Which part of the alimentary tract is not involved in digestion?

Options

A. Stomach
B. Mouth
C. Esophagus
D. Small intestine

Answer

### Step-by-Step Solution:

1. **Understanding the Alimentary Tract**: The alimentary tract, also known as the digestive tract, is the pathway through which food passes and is processed in the body. It includes several parts, each with specific functions in the digestion process.

2. **Identifying the Parts of the Alimentary Tract**: The main parts of the alimentary tract include:
- Mouth (Baccal cavity)
- Esophagus (Food pipe)
- Stomach
- Small intestine
- Large intestine
- Rectum
- Anus

3. **Analyzing Each Part for Digestion**:
- **Mouth**: The mouth is involved in the initial digestion of starch due to the presence of salivary amylase.
- **Esophagus**: The esophagus is a tubular structure that connects the mouth to the stomach. It primarily functions to transport food and does not participate in digestion.
- **Stomach**: The stomach is involved in the digestion of proteins through the enzyme pepsin.
- **Small Intestine**: The small intestine is where the majority of digestion occurs, including the breakdown of carbohydrates, proteins, and fats.
- **Large Intestine**: The large intestine is not involved in digestion but plays a role in the absorption of water and electrolytes.
- **Rectum and Anus**: These parts are involved in the storage and excretion of undigested food.

4. **Conclusion**: Among the parts of the alimentary tract, the esophagus is the only part that is not involved in the digestion of food.

### Final Answer:
The part of the alimentary tract that is not involved in digestion is the **Esophagus**.

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