8.5 POJA-L382. The terminal part of the airway: alveoli

8.5 POJA-L400. Capillary system of lung alveoli

8.5 POJA-L385. The alveolus and air-blood barrier in the lung

8.5 POJA-L386. The air-blood barrier in the lung

​8.5  POJA-L382

Title: The terminal part of the airway: alveoli 
 
Description:
Electron microscopy, dog. (A) indicate alveoli; (C) indicate capillaries. (1) Type I alveolar cell (pneumocyte I, squamous alveolar cell);  (2) type II alveolar cell (pneumocyte II, great alveolar cell); (3) alveolar macrophage. (4) endothelium of capillary. 
 

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​8.5  POJA-L400

Title: Capillary system of lung alveoli 
 
Description:
Stain by injecting the specimen with trypan blue in gelatin via the pulmonary system, cat. In a tangential view the blue-stained dense capillary plexus surrounding each alveolus is well depicted.
 

​8.5  POJA-L385

Title: The alveolus and Air-Blood  barrier in the lung 
 
Description:
Electron microscopy, rat. The alveolus (1) is lined by a thin extension (2) of the alveolar epithelial cell type I (2), the pneumocyte I and the thin endothelium (3) of the capillary filled with erythrocytes (4) and blood platelets (5). The thin-walled air-blood barrier (↔) consists of the transition from endothelium→ a common single basal lamina →pneumocyte I. Note that oxygen diffusion also takes place at the other  transitions, the so-called thick walled areas.  Thin-walled areas  are most favourable to gas exchange and alternate with thick-walled areas (thick line, ▬) consisting of supporting fibers, extracellular matrix and cells of the alveolar framework that separate the alveolar epithelium from the capillaries.
 

8.5  POJA-L386

Title: The air-blood barrier in the lung 
 
Description:
Electron microscopy, rat. The alveolar space (1) and the capillary  space (2) (with part of an erythrocyte, 3) are separated from each other respectively by cytoplasm of endothelial cell (5), the common basal lamina (6) with a lamina densa (6a) and the type I alveolar cell (4, pneumocyte I).  Note numerous transport vesicles (pinocytosis, diacytosis) in (4) and (6).The air-blood barrier consists of  the layers (4) + (6) + (5).  Thin-walled areas  are most favourable to gas exchange and alternate with thick-walled areas (not shown here) consisting of supporting fibers, extracellular matrix and cells of the alveolar framework that separate the alveolar epithelium from the capillaries.
 
Keywords/Mesh: respiratory tract, lung, alveolus, capillary, alveolar cell, pneumocyte I, alveolar cell type I,  pneumocyte II, alveolar macrophage, Air-Blood barrier, histology, electron microscopy, POJA collection

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