Page 687 - Atlas of Histology with Functional Correlations

barrier

Type II alveolar cells (type II pneumocytes) are adjacent to type I alveolar
cells
Type II alveolar cells are secretory cells whose apices project above type I
alveolar cells
Contain numerous secretory lamellar bodies

Synthesize phospholipid surfactant for alveoli to reduce surface tension
Surfactant reduces alveolar surface tension, allowing expansion and
preventing collapse

During fetal development, sufficient amount of surfactant produced for
respiration
Surfactant has bactericidal effects to counteract inhaled pathogens
Type II alveolar cells also serve as stem cells to replace type I cells after
injury to lung

Alveolar Macrophages

Are blood monocytes that enter pulmonary connective tissue and alveoli
Clean alveoli of invading organisms and phagocytose particular matter

Epiglottis

Superior part of larynx that projects upward from larynx wall
A central elastic cartilage forms core of the epiglottis

Stratified squamous epithelium lines lingual (anterior) and part of laryngeal
(posterior) surface
Base of epiglottis lined with pseudostratified ciliated columnar epithelium

Taste buds may be present in lingual or laryngeal epithelium

Larynx

Pseudostratified ciliated columnar epithelium lines false vocal fold, as

posterior epiglottis
Mixed seromucous glands, blood vessels, lymphatic nodules, and adipose
cells in lamina propria
Ventricle, a deep indentation, separates false vocal fold from true vocal fold

True vocal fold lined with stratified squamous nonkeratinized epithelium

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