Which is the next structure to contact air after it passes from the nose to the nasal cavity?

• A. Trachea
• B. Pharynx
• C. Larynx
• D. Bronchi

Answer: (B)

Verified step by step guidance

1. Begin by understanding the pathway of air as it enters the respiratory system. Air first enters through the nose, where it is filtered, warmed, and humidified.
2. After passing through the nose, air moves into the nasal cavity. The nasal cavity is lined with mucous membranes and tiny hairs called cilia that help trap particles and pathogens.
3. Next, air travels from the nasal cavity to the pharynx. The pharynx is a muscular tube that serves as a passageway for both air and food. It is divided into three regions: nasopharynx, oropharynx, and laryngopharynx.
4. From the pharynx, air continues its journey into the larynx. The larynx, also known as the voice box, is responsible for sound production and also acts as a passageway for air to enter the lower respiratory tract.
5. Finally, air moves from the larynx into the trachea, which is a tube that connects the larynx to the bronchi, leading to the lungs. The trachea is reinforced with cartilage rings to maintain its structure and ensure unobstructed airflow.