What intercommunicating channels permit collateral ventilation between adjacent alveoli and primary lobules? 1. Bronchial anastomoses 2. Canals of Lambert 3. Pores of Kohn 4. Terminal bronchioles
a. 1, 2, and 3 only
b. 1 and 4 only
c. 2 and 3 only
d. 1, 2, 3, and 4
ANS: C
Small openings are located in the alveolar septa. Some of the openings allow gas to move from one alveolus to another. These are called the pores of Kohn. Other openings connect alveoli with secondary respiratory bronchioles. These passageways are called the canals of Lambert. All of these alveolar openings and passageways facilitate the collateral movement of gas and help maintain alveolar volume.
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