How do cilia function in the respiratory system?

Cilia play a critical role in the respiratory system by wafting mucus into the throat. They are tiny, hair-like structures that line the airways and are responsible for moving mucus, which traps dust, pathogens, and other particles, upward towards the throat. This action is vital for maintaining respiratory health, as it helps clear irritants and pathogens from the airways, allowing for easier breathing and reducing the risk of infections.

In this context, the other functions mentioned do not relate directly to the role of cilia in the respiratory system. For instance, trapping allergens is primarily the job of mucus itself, not specifically cilia. Producing digestive enzymes is a function associated with different cells in the digestive system, not the respiratory system, and filtering sound is not a role associated with cilia at all. Thus, the primary function of cilia in the respiratory context is effectively wafting mucus, which is crucial for enhancing respiratory function and protecting the lungs from unwanted particles.