Which of the following statements are true of the DRG?
I.It consists mainly of inspiratory neurons.
II.It sends impulses to the phrenic and external intercostal motor nerves in the spinal cord.
III.It provides the main stimulus for inspiration.
IV.These neurons are involved in the Hering-Breuer and Head's reflexes.

Question

Quizplus · Accepted Answer

As shown in Figure 11-1, the dorsal respiratory group (DRG) consists mainly of inspiratory neurons located bilaterally in an area called the nucleus of the tractus solitarius (NTS). These neurons send impulses to the phrenic and external intercostal motor nerves in the spinal cord, providing the main stimulus for inspiration. The vagus and glossopharyngeal nerves trAnswermit many sensory impulses to the DRG from the lungs, airways, peripheral chemoreceptors, and joint proprioceptors. These impulses modify the basic breathing pattern generated in the medulla. The DRG consists of two neuron populations, one of which is inhibited by deep lung inflation (causing cessation of inspiratory effort); the other is excited by lung inflation (causing continued inspiratory effort). These neurons are involved in the Hering-Breuer and Head's reflexes.

Which of the Following Statements Are True of the DRG