Freeze-fracture study of the turtle lung

Dr.HelmutBartels; UlrichWelsch

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Freeze-fracture study of the turtle lung

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The air-blood barrier in the lung of the turtlePseudemys scriptawas studied by means of freeze-fracture replicas in an attempt to give a detailed account on the structural organization of the intercellular junctions. Between the pneumocytes, zonulae occludentes containing 4–19 strands in the apico-basal direction are present; they are considered to be physiologically very tight. In the endothelium, fasciae occludentes, i.e., discontinuous occluding junctions can be found, composed of up to 4 strands. These junctions are regarded to be very leaky. The findings are discussed in relation to recent physiological results, suggesting that in comparison with ‘dry’ mammalian lungs, the turtle lung is a rather wet lung based on its much larger transcapillary fluid filtration into the interstitium. In addition, small maculae communicantes are demonstrated between the pneumocytes; they possibly serve for metabolic cou

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《cell and tissue research》 |1983年第1期|157-172|共页
作者
Dr.HelmutBartels; UlrichWelsch;
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作者单位

Laboratory of Electron Microscopy, Hannover Medical School;

University of Kiel;

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Freeze-fracture study of the turtle lung

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