An Individual with Early Lung Disease Has a Tidal Volume

Multiple Choice

An individual with early lung disease has a tidal volume of 500 mL.What is the alveolar volume if the dead space doubles and the tidal volume remains the same? (Assume that the normal ratio of dead space ventilation per minute to tidal volume [V_D/V_T] = 0.25.)

A) 150 mL
B) 250 mL
C) 300 mL
D) 400 mL