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Transition from bronchus to bronchiole

This longitudinal section shows a respiratory passageway transitioning from a bronchus (right of the line) to a bronchiole (left). Both are lined by a pseudostratified columnar epithelium with cilia and goblet cells, and their mucosae contain smooth muscle. Cartilage and glands are not present in bronchioles, features that serve to readily distinguish these passageways. 100x

Bronchus <p>This longitudinal section shows a respiratory passageway transitioning from a bronchus (right of the line) to a bronchiole (left). Both are lined by a pseudostratified columnar epithelium with cilia and goblet cells, and their mucosae contain smooth muscle. Cartilage and glands are not present in bronchioles, features that serve to readily distinguish these passageways. 100x </p>

Bronchus

This longitudinal section shows a respiratory passageway transitioning from a bronchus (right of the line) to a bronchiole (left). Both are lined by a pseudostratified columnar epithelium with cilia and goblet cells, and their mucosae contain smooth muscle. Cartilage and glands are not present in bronchioles, features that serve to readily distinguish these passageways. 100x

Bronchiole <p>This longitudinal section shows a respiratory passageway transitioning from a bronchus (right of the line) to a bronchiole (left). Both are lined by a pseudostratified columnar epithelium with cilia and goblet cells, and their mucosae contain smooth muscle. Cartilage and glands are not present in bronchioles, features that serve to readily distinguish these passageways. 100x</p>

Bronchiole

This longitudinal section shows a respiratory passageway transitioning from a bronchus (right of the line) to a bronchiole (left). Both are lined by a pseudostratified columnar epithelium with cilia and goblet cells, and their mucosae contain smooth muscle. Cartilage and glands are not present in bronchioles, features that serve to readily distinguish these passageways. 100x

Smooth muscle <p>This longitudinal section shows a respiratory passageway transitioning from a bronchus (right of the line) to a bronchiole (left). Both are lined by a pseudostratified columnar epithelium with cilia and goblet cells, and their mucosae contain smooth muscle. Cartilage and glands are not present in bronchioles, features that serve to readily distinguish these passageways. 100x</p>

Smooth muscle

This longitudinal section shows a respiratory passageway transitioning from a bronchus (right of the line) to a bronchiole (left). Both are lined by a pseudostratified columnar epithelium with cilia and goblet cells, and their mucosae contain smooth muscle. Cartilage and glands are not present in bronchioles, features that serve to readily distinguish these passageways. 100x

Cartilage plates <p>This longitudinal section shows a respiratory passageway transitioning from a bronchus (right of the line) to a bronchiole (left). Both are lined by a pseudostratified columnar epithelium with cilia and goblet cells, and their mucosae contain smooth muscle. Cartilage and glands are not present in bronchioles, features that serve to readily distinguish these passageways. 100x</p>

Cartilage plates

This longitudinal section shows a respiratory passageway transitioning from a bronchus (right of the line) to a bronchiole (left). Both are lined by a pseudostratified columnar epithelium with cilia and goblet cells, and their mucosae contain smooth muscle. Cartilage and glands are not present in bronchioles, features that serve to readily distinguish these passageways. 100x

Alveoli <p>This longitudinal section shows a respiratory passageway transitioning from a bronchus (right of the line) to a bronchiole (left). Both are lined by a pseudostratified columnar epithelium with cilia and goblet cells, and their mucosae contain smooth muscle. Cartilage and glands are not present in bronchioles, features that serve to readily distinguish these passageways. 100x</p>

Alveoli

This longitudinal section shows a respiratory passageway transitioning from a bronchus (right of the line) to a bronchiole (left). Both are lined by a pseudostratified columnar epithelium with cilia and goblet cells, and their mucosae contain smooth muscle. Cartilage and glands are not present in bronchioles, features that serve to readily distinguish these passageways. 100x

Macrophages > <p>The black carbon particles are located in macrophages that have phagocytosed inhaled particulate matter. These cells, often referred to as dust cells, migrate into alveolar spaces where they remove debris and then accumulate in the surrounding connective tissue.</p>

Macrophages >

The black carbon particles are located in macrophages that have phagocytosed inhaled particulate matter. These cells, often referred to as dust cells, migrate into alveolar spaces where they remove debris and then accumulate in the surrounding connective tissue.

Main Slide Bronchus Bronchiole Smooth muscle Cartilage plates Alveoli Macrophages >