Kaplan Nursing Entrance Practice Exam

Which of the following air passages helps to filter and warm inhaled air?

1. Nose

2. Pharynx

3. Larynx

4. Bronchi

The correct answer is: Nose

The nose plays a critical role in the respiratory system by serving as the primary entry point for inhaled air. It is well-structured with nasal hairs, a mucous lining, and a complex network of blood vessels that contribute to its functions. Nasal hairs help filter out larger particles, such as dust and pollen, from the air, preventing them from entering the lungs. The mucous membrane not only traps smaller particles and pathogens but also moisturizes the air, increasing its humidity. Additionally, the extensive blood supply in the nasal passages warms the air as it passes through, ensuring that the air reaching the lungs is at an appropriate temperature for optimal gas exchange. Other air passages, such as the pharynx, larynx, and bronchi, have their own specific functions. The pharynx serves as a pathway for both air and food, while the larynx is involved in sound production and also protects the trachea against aspiration. The bronchi primarily serve as conduits for air to the lungs but do not significantly filter or warm the air in the same way that the nose does. Therefore, the nose is the key structure responsible for filtering and warming the inhaled air.