The mucus blanket and the cilia that move it to the pharynx act as a purification mechanism for the respiratory system.

Name: The mucus blanket and the cilia that move it to the pharynx act as a purification mechanism for the respiratory system.
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The mucus blanket traps small particles and pollutants, while the cilia move it upward to the pharynx where it can be coughed or sneezed out, therefore acting as a purification mechanism for the respiratory system.

The Mucus Blanket and the Cilia That Move It to the Pharynx