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Chapter 9: Problem 8

What is the function of the mucus and cilia lining the respiratory passages?

Short Answer

Expert verified
The mucus in the respiratory passages acts as a protective layer, trapping harmful inhaled particles. Cilia, as tiny hair-like structures, aid in moving this mucus upwards and out of the respiratory system, thus preventing these trapped particles from reaching the lungs. Together, they form an essential defense mechanism of the respiratory system against potential infections and diseases.

Step by step solution

01

Function of Mucus

The mucus in the respiratory passages serves as a protective layer. It traps dust, bacteria, viruses, and other harmful particles that are breathed in, preventing them from reaching the lungs.
02

Function of Cilia

Cilia are small hair-like structures on the surface of the cell lining of the respiratory passages. These structures wiggle or beat in a coordinated rhythmic manner to move the mucus along, thereby assisting in the transportation of trapped particles out of the body.
03

Combination of Mucus and Cilia Functions

Together, mucus and cilia create a defense mechanism in the respiratory system. The mucus traps harmful particles and the cilia move this mucus out of the respiratory system, preventing infections and diseases.

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