In a similar manner as the kidney, the lung demonstrates functional unity; that is, each unit is structurally and functionally identical. The basic physiological unit of the lung is the respiratory unit, which consists of:
A. nonrespiratory and respiratory bronchioles, and alveolar ducts and sacs
B. respiratory bronchioles and alveolar ducts and sacs
C. bronchi, nonrespiratory bronchioles, and respiratory bronchioles
D. conducting airways and alveolar ducts and sacs
ANS: B
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