FIGURE 21.1 Anatomy and Infections of the Respiratory System (a) Lateral view of upper respiratory tract. (b) Frontal vlew of the upper and lower resplratory Columnar epithelium tracts. A Why would inflammation in the lungs be life-threatening? Secretory (goblet) cell Mucus Cilia Frontal sinus Flow of mucus Adenoviral pharyngitis Common cold Diphtheria Ear infections Epiglottitis Laryngitis Strep throat Tonsillitis - Sphenoid sinus Adenoids Eustachian tube opening Opening of maxillary sinus Nasolacrimal- duct opening Tonsil Pharynx Epiglottis Larynx (a) Frontal sinus Nasal chamber Upper Respiratory System Nasolacrimal duct -Middle ear Mastoid air cell Bronchioles Eustachian tube Alveoli (air sacs) -Maxillary sinus Pharynx Trachea Capillaries Bronchi Pleura Lower Respiratory System Arterioles Lungs Bronchiolitis (b) Legionnaires' disease Pleurisy Pneumonia Bronchitis Coccidioidomycosis Hantavirus pulmonary syndrome Histoplasmosis Influenza RSV infections Tuberculosis Pertussis

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