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It gets caught in the mucus of the respiratory tract, and then the small cilia moves them up towards the mouth. Then you either cough it out or swallow it, so it goes into your stomach instead of your lungs.

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12y ago
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12y ago

Pathogens can enter the body through the respiratory system. Pathogens that cause influenza, tuberculosis and bronchitis infect in this way. However the respiratory system has defenses to trap these pathogens and expels them. The first is mucus in the throat, this is a thick gooey like substance produced by the goblet cell, it is there to catch up the pathogens and it can be coughed up. Another defence are the microscopic hairs in the trachea, these are called cilia and are there to stop pathogens being taken into the body, so they get trapped and can be expelled by the mucus.

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10y ago

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Q: How are dust particles that enter the respiratory system in the air expelled?
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The respiratory system.


Why do you have the respiratory system?

The respiratory system is the system for breathing. The system allows for oxygen to enter the body and carbon dioxide to exit.


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