Which Statement Concerning the Dorsal Respiratory Group (DRG)is Correct

Multiple Choice

Which statement concerning the dorsal respiratory group (DRG) is correct?

A) The DRG consists of both inspiratory neurons and expiratory neurons.
B) The neurons of the DRG remain inactive during normal quiet breathing.
C) The DRG is called into play by the VRG as when demands for ventilation are increased.
D) Inspiration takes place when DRG inspiratory neurons fire.