ANIMAL PHYSIOLOGY
GAS EXCHANGE IN HUMANS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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extends from the nasal cavity to the bronchi
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is lined with cilia
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lies posterior to the esophagus
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is the passageway for food into the stomach
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Detailed explanation-1: -The bronchus in the lungs are lined with hair-like projections called cilia that move microbes and debris up and out of the airways. Scattered throughout the cilia are goblet cells that secrete mucus which helps protect the lining of the bronchus and trap microorganisms.
Detailed explanation-2: -Pseudostratified epithelium is a single cell layer specially the goblet cells. The Goblet cells are one to produce moisty fluid called mucus that attracts germs entering into the organ and thus purifies the tract.
Detailed explanation-3: -The inside of the trachea is lined with pseudostratified ciliated columnar epithelium, which is continuous with the larynx. This epithelial layer has mucus producing goblet cells that are only visible at high magnification.