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In the respiratory system, epithelial cells

remove carbon dioxide from the body.
act as a passageway by which air moves into the lungs.
secrete fluids that protect the inside of the trachea.
transfer oxygen to the cells in the body.

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User Lavavrik
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The answer is that Epithelial cells act as a passageway in which the air moves into the lungs. The epithelial cells in the respiratory system would serve as a leak proof barrier that do transports, filters as well as conditions the air one is breathing.

User Serverfaces
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Answer:

Epithelial cells of the lung are located at the interface between the environment and the organism and serve many important functions including barrier protection, fluid balance, clearance of particulate, initiation of immune responses, mucus and surfactant production, and repair following injury.

Step-by-step explanation:

User Lelly
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