Title: Air-Blood barrier in the lung
Scheme electron microscopy, human . (1, ↓) Represents type I pneumocytes lining alveolar spaces (A). Cell (2) represents a free alveolar macrophage. The type II pneumocyte (3) is adherent to type I pneumocyte extensions (note junctional connection), and contains multilamellar bodies (surfactant). A myofibroblast (4) is located in the interstitium (note surrounding cross-sectioned collagen fiber dots), and (*) indicate elastin. (5, ↓) Indicate endothelial cells within the capillaries. (6↔) Indicates the thin-walled area of the air-blood barrier.
Title: Elastin in alveolar tip
Immuno-electron microscopy (embedded in Lowicryl HM 20), adult human. Amorph elastine (E) is present at two sites, it appears pale after embedding in this type of resin and is antibody-labeled with electron-dense gold particles of 10 nm. (Col) indicate bundles of collagen fibers which are intermingled with swollen cytoplasmic extensions of myofibroblasts (F). An alveolar capillary (Cap) with an unlabelled endothelial cell (2) and a pericyte (3) is indicated. (A) indicates alveolar space and (1) is a thin alveolar epithelial cell.
Title: Elastin in alveolus
Immuno-electron microscopy (embedded in Lowicryl HM 20), adult human. Elastin (E) is labeled with electron-dense gold particles of 10 nm. Note that the strands of amorph elastin appears pale in this procedure. (A) indicates alveolar space, (F) unlabelled myofibrolast, (C) collagen fibers, and (1) the thin lining alveolar cells type I.
Keywords/Mesh: respiratory system, lung, alveolus, alveolar cell, alveolar macrophage, type II pneumocyte, type I pneumocyte, alveolar cell type I, Air-Blood barrier, endothelial cell, Weibel-Palade bodies, von Willebrand factor, capillary, elastin, collagen,
myofibroblast, histology, electron microscopy, POJA collection