What changes occur in the gas that enters nasal cavity
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The lungs are the organs in which gas exchange takes place between blood and air. Air enters the respiratory system through the nose. As the air passes through the nasal cavity, mucus and hairs trap any particles in the air. The air is also warmed and moistened so it won't harm delicate tissues of the lungs.
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Answer: In our respiratory system air enters through the nasal cavity, as air enter in nasal cavity there are many tiny hairs present with mucus this filters the hair from dust which and we can say that it does not allow the dust or other substance to enter in our lungs.
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