Answer
(a) Lungs
Work Step by Step
Lungs are normally free of microorganisms. But the nasal cavity, pharynx, trachea and bronchi usually contain microorganisms.
Microbiology: Principles and Explorations 9th Edition
by Black, Jacquelyn G.; Black, Laura
Published by
Wiley
ISBN 10:
1-11874-316-4
ISBN 13:
978-1-11874-316-4
Chapter 21 - Diseases of the Respiratory System - Self Quiz - Page 687: 2
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