Which of these statements correctly describes the dorsal respiratory group (DRG)?
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 when the demand for ventilation is increased.
D) Inspiration takes place when DRG inspiratory neurons fire.

Question

Quizplus · Accepted Answer

The dorsal respiratory group (DRG) is responsible for setting the basic rhythm of breathing, and consists mainly of inspiratory neurons. The firing of DRG inspiratory neurons leads to inspiration. The expiratory neurons are located in the ventral respiratory group (VRG). Therefore, option A is incorrect. The DRG is constantly active during breathing, even during quiet breathing, to maintain the basic rhythm. Therefore, option B is also incorrect. The VRG is activated by the DRG to increase the depth and frequency of ventilation as per the demand, making option C incorrect.

Which of These Statements Correctly Describes the Dorsal Respiratory Group