In which part of the alimentary canal the negligible amount of absorption of substance take place?

Options

A. mouth
B. oesophagus
C. stomach
D. small intestine

Answer

To determine the part of the alimentary canal where negligible absorption of substances takes place, we can analyze the functions of various sections of the alimentary canal.

### Step-by-Step Solution:

1. **Identify the Parts of the Alimentary Canal**: The alimentary canal consists of several parts, including the mouth, esophagus, stomach, small intestine, and large intestine.

2. **Understand the Function of Each Part**:
- **Mouth**: Some absorption occurs here, particularly with certain drugs that can be absorbed through the mucosa.
- **Esophagus**: This part primarily serves as a passageway for food from the mouth to the stomach. It does not have any digestive glands and is not involved in the digestion or absorption of nutrients.
- **Stomach**: Absorption of water, simple sugars, and alcohol can occur here.
- **Small Intestine**: This is the primary site for nutrient absorption, where the final products of digestion are absorbed into the bloodstream.
- **Large Intestine**: Some absorption of water and minerals occurs here.

3. **Analyze the Esophagus**: The esophagus is a muscular tube that connects the throat (pharynx) with the stomach. It does not have any digestive glands and is not involved in significant digestive or absorptive processes.

4. **Conclusion**: Since the esophagus does not facilitate any absorption of nutrients or substances, we can conclude that the part of the alimentary canal where negligible absorption occurs is the **esophagus**.

### Final Answer:
The part of the alimentary canal where negligible absorption of substances takes place is the **esophagus**.

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