During eupnea, spontaneous discharge occurs in the
expiratory neurons (E neurons)
inspiratory neurons (I neurons)
neurons of the pontine apneustic center
dorsal group of respiratory neurons
Options:
A. 1 only
B. 1 and 3
C. 2 and 3
D. 2 and 4
E. 1, 2, 3 and 4
D. 2 and 4