In what way does excessive mucus hinder upper respiratory function?

• A. It improves airflow
• B. It prevents airway drying
• C. It can block airways and promote infections
• D. It has no impact on respiratory function

Answer: (C)

Excess mucus disrupts airway function by overwhelming the normal defense and clearance systems. The nose and upper tract constantly produce mucus to trap debris and microbes, and cilia move this mucus out of the airways. When mucus becomes excessive or thick, it can pool and form plugs that narrow or block air passages, making it harder to breathe and reducing airflow. This stagnation also creates a favorable environment for bacteria, raising the risk of infections such as sinusitis or rhinitis. So, far from helping, too much mucus impedes airflow and promotes infection.