What will happen to respiration if both vagi are cut?
104. Ans. (c) Increase in depth of RespirationRef.-.Page number 656: Ganong 25th ed.Manifestation after both vagi are cutStretching of the lungs during inspiration initiates impulses in afferent pulmonary vagal discharges.These impulses inhibit inspiratory discharge.Hence after Vagotomy the impulses inhibiting inspiratory discharge are absent and this will result in increase of depth of respiration.Manifestation after Pneumotaxic center is damagedPneumotaxic center is dorsal pons which contains neurons active in active inspiration and expiration.When this area is damaged respiration will become slower and tidal volume greater.Manifestation after both vagi are cut after damage to Pneumotaxic centerIf vagi are cut after damage to pneumotaxic centre, apneusis (Prolonged inspiratory spasms that resemble breath holding) will develop
Becomes slow and deep
Becomes fast and shallow
Increase in depth of respiration
Increase in rate of breathing
Regulation of Respiration