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Physiology

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Respiration

Question
4 out of 9
 

Pace maker of respiration lies at: (AIIMS NOV 2009)



A DRG
B Pneumotaxiccentre

C Apneusticcentre
D Pre botzinger complex

Ans. D Prebotzinger complex

I. MEDULLA – has pre botzinger complex which acts as pacemaker for spontaneous respiration, also contains DRG & VRG(DORSAL &VENTRAL RESPIRATORY GROUP OF NEURONS).

a. DRG - contains inspiratory neurons which supply inspiratory muscles.

b. VRG - both inspiratory & expiratory neurons.

II. PONS – contain 2 centres

a. Apneusticcentre (in lower pons) : stimulates inspiratory neurons. If not inhibited by vagus and pneumotaxiccentre will cause apneusis.

b. Pneumotaxiccentre(in upper pons) : inhibit apneusticcentre.