File:Respiratory histology 03.jpg
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Respiratory Alveoli
(Stain - Haematoxylin Eosin)
Structure of the functional unit of the lung, note the capillary embedded in wall. Compare the structure with alveoli cartoon.
Alveolar type I cells
- small alveolar cells or type I pneumocytes
- are extremely flattened (the cell may be as thin as 0.05 µm) and branched
- form the bulk (95%) of the surface of the alveolar walls.
- The shape of the cells is very complex, and they may actually form part of the epithelium on both faces of the alveolar wall.
- multiple cytoplasmic plates and relatively devoid of organelles
- plates represent the gas exchange surface in the alveolus.
Alveolar type II cells
- large alveolar cells or type II pneumocytes
- about as many type II cells as type I cells (cell shape accounts for small contribution to alveolar area).
- irregularly (sometimes cuboidal) shaped.
- form small bulges on the alveolar walls.
- contain are large number of granules called cytosomes (or multilamellar bodies)
- consist of precursors to pulmonary surfactant (mixture of phospholipids that keep surface tension in the alveoli low).
- can act as a progenitor cell for both type I and type II cells.
Alveolar Macrophage
- dust cell
- monocyte-derived immune system cell
- removes debris and microorganisms from the alveoli.
- subset of pulmonary macrophages.
- Respiratory Histology: Bronchiole | Alveolar Duct | Alveoli | EM Alveoli septum | Alveoli Elastin | Trachea 1 | Trachea 2 | labeled lung | unlabeled lung | Respiratory Bronchiole | Lung Reticular Fibres | Nasal Inferior Concha | Nasal Respiratory Epithelium | Olfactory Region overview | Olfactory Region Epithelium | Histology Stains
Links: Histology | Histology Stains | Blue Histology images copyright Lutz Slomianka 1998-2009. The literary and artistic works on the original Blue Histology website may be reproduced, adapted, published and distributed for non-commercial purposes. See also the page Histology Stains.
Cite this page: Hill, M.A. (2024, April 27) Embryology Respiratory histology 03.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Respiratory_histology_03.jpg
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
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| current | 19:45, 27 February 2012 | | 450 × 600 (29 KB) | Z8600021 (talk | contribs) | |
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| 15:47, 2 March 2011 |  | 300 × 400 (27 KB) | S8600021 (talk | contribs) | ==Respiratory Alveoli== Respiratory histology 03.jpg Original file name: Lun40he.jpg {{Template:Blue Histology}} Category:Respiratory |
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