Lower respiratory tract: MedlinePlus Medical Encyclopedia Image

The major passages and structures of the lower respiratory tract include the windpipe (trachea) and within the lungs, the bronchi, bronchioles, and alveoli. Deep in the lungs, each bronchus divides into

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Respiratory System – Medical Terminology for Healthcare Professions

CMV - gastroenteritis/colitis: MedlinePlus Medical Encyclopedia

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Acute bronchitis: MedlinePlus Medical Encyclopedia

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Sagittal view of head and diagrams of laryngeal structures Respiratory system, Respiratory, Respiratory system anatomy

Bronchiolitis: Symptoms, Causes, and Treatments