Why does congential central hypoventilation syndrome (CCHS) not affect voluntary breathing
(a) involuntary breathing is jnder the control of descending corricospinal tracts
(b) The peripheral chemorecptors are still intact
(c) Corticospinal tracts are lost
(d) CCHS affects the brainstem, leaving descending control of breathing intact
(e) CCHS does affect voluntary breathing