Microbiology: A Systems Approach
Microbiology: A Systems Approach
5th Edition
ISBN: 9781259706615
Author: Marjorie Kelly Cowan Professor
Publisher: McGraw-Hill Education
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Chapter 21.1, Problem 2AYP
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The natural defenses present in the respiratory tract.

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Natural defenses in the human system prevent the entry of foreign particles which can cause infection inside the human system. Respiratory system is divided into lower and upper respiratory tracts. Bronchioles are air-filled structures which get inflated as air enters the lungs.

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