Alveolar capillary, electron micrograph
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| Micrograph courtesy of Jeff Morton |
This
micrograph illustrates one capillary within an alveolar wall.includes portions
of several glomerular capillaries.
Gas molecules diffusing from alveolar air space to capillary lumen (or vice versa) must pass through the the alveolar epithelium and the capillary endothelium as well as the intervening basement membranes.