Abstract
Observations made on wet and dry slices of inflated human lungs taken at necropsy have been used to give a more complete account of the alveolar duct system, the basic respiratory structure. This includes consideration of the central spiral alveolar duct fibre, which is thought to consist of elastic and collagen, the spiral arrangement of alveoli and the special nature of the terminal alveolus, the interdigitation of alveoli from adjacent alveolar ducts and the arrangement of pulmonary arterioles. This suggests that the alveolar duct system is specifically designed so that changes in volume are not accompanied by changes in alveolar surface area.
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Selected References
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