Which of the following lists the components of the respiratory membrane? A. alveolar epithelial cells, capillary endothelial cells and their basement membranes B. fl uid and surfactant alveolar epithelial cells, capillary endothelial cells and their basement membranes C. visceral pleura, parietal pleura and serous fl uid. D. ciliated epithelial cells, mucus cells and secreted mucus
Option B. The epithelium of the alveoli and capillary (along with the base- ment membrane), and the fl uid covering the alveolar surface (which includes surfactant) collectively formed the breathing membrane thru which gases must pass.
