The Respiratory System

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Presentation transcript:

The Respiratory System Trachea (No.3) Lung (No.31) Jun Zhou School of Medicine, Zhejiang University 20180531

Trachea C-shape hyaline cartilage Mucosa Submucosa adventitia

Mucosa:ciliated,pseudostratified epithelium+lamina propria Submucosa:denser CT+mucous,serous glands Adventitia:hyaline cartilage+CT

Posterior border: numerous glands+ smooth muscle

Pseudostratified columnar ciliated epithelia goblet cell, cilia cell and basal cell, brush cell and small granule cell Obvious basement membrane Tracheal glands (serous, mucous)

Lung Conducting portion: Small bronchi Bonchioles Terminal bronchioles Respiratory portion: Respiratory bronchioles Alveolar ducts Alveolar sacs Alveoli

Human lung (NO.31) Respiratory bronchiole Bronchiole Terminal bronchiole Bronchia

Conducting portion Bronchiole Bronchia Terminal bronchiole

Small bronchi pseudostratified ciliated epi. Smooth muscle in lamina propria Incomplete cartilage rings

Bronchiloes Smaller lumen and thinner wall Epi from pseudostratified columnar to simple cuboidal Rare goblet cell, glands and cartilage More smooth muscle

Terminal bronchiloes Simple cuboidal ciliated epi. No glands, cartilage Completed layer of smooth layer

Respiratory branchioles: Wall with alveoli opening on it. Alveolar ducts: Almost no walls, with smooth muscle knob Alveolar sacs: No smooth muscle knob Alveoli: Actual site of gas exchange

respiratory portion Alveolar duct Respiratory bronchiole Alveolar sac

Pulmonary Alveoli Type I alveolar cell Type II alveolar cell Alveolar septum

Dust cell phagocytose carbon or dust particles

Alveoli with dust cells in the septa

Blood-air barrier

The end!