<prompt> Pacemaker regulating the rate of respiration-Pneumotaxic centreDorsal group of nucleusApneustic centrePre-Botzinger complex  <response>: Ans. d Pre-Botzinger complexRef: Ganong, 25th edp.655Pre-Botzinger Complex - The pacemakers of respirationInitiates the respiratory rhythmThis complex contains six group of neurons that functions as central pattern generator for initiation of respirationLocated in the ventrolateral medullaRhythmically drives the discharge of phrenic motor neurons that innervate diaphragm 