1. Concerning the airways of the human lung:A. The volume of the conducting zone is about 50 ml.B. The volume of the rest of the lung during resting conditions is about 5 liters.C. A respiratory bronchiole can be distinguished from a terminalbronchiole because the latter has alveoli in its walls.D. On average, there are about three branchings of the conductingairways before the first alveoli appear in their walls.E. In the alveolar ducts, the predominant mode of gas flow is diffusion rather than convection.

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