Which of the following is NOT part of the 'respiratory membrane' through which diffusion of gases occurs?
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Correct answer: Ciliated columnar epithelium of bronchioles
The diffusion membrane is made up of three layers: the thin squamous epithelium of alveoli, the endothelium of alveolar capillaries, and the basement substance in between. Ciliated columnar epithelium is part of the conducting zone, not the diffusion membrane.
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