Further back in your nose are even smaller hairs called cilia say SILL ee uh that you can see only with a microscope. The cilia move back and forth to move the mucus out of the sinuses and back of the nose. Cilia can also be found lining the air passages, where they help move mucus out of the lungs..Larger particles are trapped by the nasal vibrissae hairs at the front of the nose . Smaller particles are trapped in the mucus, considered to be one of the initial defenses of the airway. Figure Representation of cilia in the upper respiratory system..Usually, the mucus traps incoming dirt particles, which are then moved by the cilia toward the front of the nose or down the throat to be removed from the airway. Like the nasal cavity, the sinuses are lined with a mucous membrane composed of cells that produce mucus and have cilia..Cilia or small hairs which project from the epithelium and line the nasal mucosa create motions which drain mucus from the nasal passage .
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