Which of the following is not a part of respiratory tract

Options

A. Nasal chamber
B. Oesophagus
C. Pharynx
D. Trachea

Answer

To determine which of the following is not a part of the respiratory tract, we need to analyze each option provided:

1. **Nasal Chamber**: The nasal chamber is the initial part of the respiratory tract where air enters. It filters, warms, and humidifies the air before it moves further into the respiratory system. Therefore, the nasal chamber is a part of the respiratory tract.

2. **Esophagus**: The esophagus is a muscular tube that connects the throat (pharynx) with the stomach. It is primarily involved in the digestive system, transporting food and liquids from the mouth to the stomach. Since it does not play a role in respiration, the esophagus is not a part of the respiratory tract.

3. **Pharynx**: The pharynx is a common passage for both air and food. It connects the nasal cavity to the larynx (for air) and the esophagus (for food). The pharynx is indeed a part of the respiratory tract.

4. **Trachea**: The trachea, also known as the windpipe, is a crucial part of the respiratory system. It conducts air from the larynx down to the bronchi and into the lungs. Thus, the trachea is also a part of the respiratory tract.

Based on this analysis, the correct answer is:

**Esophagus** (Option B) is not a part of the respiratory tract.