Alveolar sacs of the lung. The bronchioles, which are not lined with alveolar capillaries, give rise to alveolar sacs. Alveolar sacs are blind ended pouches lined with alveolar capillaries and pneumocytes. This is the location where gas exchange occurs with the erythrocytes. Image from AF Wiechmann and CR Wirsig (2003) "Color Atlas of Xenopus laevis Histology", (page 53, Chapter 5, Respiratory system: Figure 16). Copyright 2003. Kluwer Academic Publishers. Reproduced with kind permission from Springer Science & Business Media B.V.
Image published in: Color Atlas of Xenopus laevis Histology
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