In forceful expiration, which of the following neurons gets fired?

In forceful expiration, which of the
following neurons gets fired?
a) VRG
b) DRG
c) Pneumotaxic centre
d) Chemoreceptors
Correct Answer - A
Ans: A. VRG
Medullary respiratory group:
Principal areas in medulla oblongata concerned with respiratory
regulation.
Includes,
Dorsal respiratory group (DRG).
Ventral respiratory group (VRG).
Pre-Botzinger complex.
Peripheral inputs.
Dorsal respiratory group (DRG):
DRG neurons –
Mainly concerned with inspiration.
Descend & terminate on spinal motor neurons innervating primary
inspiratory muscles.
I.e., Diaphragm & External intercostal muscles.
Ventral respiratory group (VRG):
VRG neurons –
Mainly concerned with forceful expiration.
Minimal activities w.r.t inspiration.
Contributes to both expiration & inspiration.