Lung Tissue


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•  Identification of pneumocytes, capillary endothelium cells and blood cells in light micrographs and electron 

    micrographs of lung tissue

The inner surface of the alveolus is lined by a special type of alveolar cell called a pneumocyte

  • Type I pneumocytes are very thin in order to mediate gas exchange with the bloodstream (via diffusion)
  • Type II pneumocytes secrete a pulmonary surfactant in order to reduce the surface tension within the alveoli

Alveolar air spaces are surrounded by a dense network of capillaries, which transport respiratory gases to and from the lungs

  • The capillaries are located close to the pneumocytes and are composed of a very thin, single-layer endothelium
  • The capillaries transport oxygen within red blood cells, while white blood cells may extravasate into the lung tissue

Diagrammatic Representation of Lung Tissue

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Light Micrograph of Lung Tissue  (click to show / hide labels)

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Electron Micrograph of Lung Tissue  (click to show / hide labels)

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