<prompt> Respiratory rhythm nucleus-Pneumotaxic centreDorsal group of nucleusApneustic centrePre-Botzinger Complex  <response>: Ans. is d i.e., Pre-Botzinger Complex Important facts about the regulation of respiration o Medullary respiratory group of neurons are - i Dorsal respiratory group DRG - Concerned with inspiration ii Ventral respiratory group VRG - Mainly concerned with Forceful expiration, but also shows some activity during inspiration. iii Pre - Botzinger complex: - Responsible for generation of respiratory rhythm. o Pontine respiratory centers are - i Pneumotaxic center - The primary function is to limit inspiration, i.e., to control the switch off point of inspiratory ramp and control of inspiratory depth. ii Apneustic center - Excites inspiratory center to prolong inspiration. 