The Flow-Type Plethysmograph Differs from the Constant Volume (Variable-Pressure)plethysmograph in Which

Multiple Choice

The flow-type plethysmograph differs from the constant volume (variable-pressure) plethysmograph in which of the following ways?

A) Forced expiratory maneuvers can be performed with the door closed.
B) Flow boxes must be rigorously air-tight.
C) Thoracic gas volume cannot be measured directly.
D) Airway resistance can be measured in small children.