Algonquin College Health Program Assessment (AC-HPAT) Practice Exam

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What is the function of the cilia in the trachea?

To trap foreign particles
To provide structural support
To waft foreign particles up the windpipe
To regulate airflow

The correct answer is: To waft foreign particles up the windpipe

The function of the cilia in the trachea is primarily to waft foreign particles up the windpipe. Cilia are tiny, hair-like structures that line the respiratory tract. Their main role is to facilitate the movement of mucus and trapped particles out of the lungs and towards the throat, where they can be swallowed or expelled. This action is part of the body's defense mechanism to keep the airways clear of debris, pathogens, and other foreign materials, thereby helping to maintain respiratory health. The coordinated beating of the cilia is essential for effective mucociliary clearance, which is crucial for preventing respiratory infections and other complications.