A. False Alveolar ventilation at rest is about 4 l/min; perfusion is about 5 l/min.
B. True In maximal exercise, alveolar ventilation may rise to about 80 l/min whereas alveolar perfusion (cardiac output) rises to about 25 l/min.
C. True Perfusion decreases from base to apex; ventilation does also but to a lesser extent.
D. True There is no evidence of O2 secretion in the lungs.
E. True The trachea and bronchi expand as the lungs expand.