Bronchi - walls of alveoli together with pulmonary...

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Bronchi & Subdivisions: The Bronchial Tree - Conducting Zone Kevin Kelleher, MTC Biology 211 Study Notes Exam 2 15 o o secondary (lobar) bronchi o tertiary (segmental) bronchi o bronchioles terminal bronchioles o tree-like pattern: bronchial or respiratory tree o tissue composition of wall changes as tubes become smaller cartilage support structures change from rings to irregular plates epithelium changes from pseudostratified columnar to columnar to cuboidal in terminal bronchioles amount of smooth muscle increases - Respiratory Zone : o terminal bronchioles feed into respiratory bronchioles , which lead into alveolar ducts that end in clusters of alveoli called alveolar sacs (grape-like clusters of alveoli) o respiratory membrane
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Unformatted text preview: : walls of alveoli together with pulmonary capillaries & their fused basal laminas (also known as air-blood barrier or alveolar-capillary membrane) type I cells : very thin simple squamous epithelium participate in gas exchange with pulmonary capillaries secrete angiotensin converting enzyme (ACE), which plays a role in blood pressure regulation type II cells : cuboidal cells scattered among the type I cells secrete a fluid containing surfactant that coats the alveolar walls o other features of alveoli : surrounded by fine elastic fibers alveolar pores connect adjacent alveoli (provide alternate air routes if alveoli collapse) alveolar macrophages (dust cells) along internal alveolar surfaces PAGE4...
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Bronchi - walls of alveoli together with pulmonary...

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