how is respiratory track protected
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Particles, such as dust and soot, mold, fungi, bacteria, and viruses deposit on airway and alveolar surfaces. Fortunately, the respiratory system has defense mechanisms to clean and protect itself. ... Cilia propel a liquid layer of mucus that covers the airways.
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By C shaped cartilage rings and ribs along with the tiny hair present inside to stop the dust and most of the germs.
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