During the micturition reflex,
A) stimulation of stretch receptors in the bladder wall sends impulses to the sacral cord.
B) sympathetic motor neurons that control the detrusor muscle become active.
C) the internal sphincter is consciously relaxed.
D) all of the above
E) none of the above

Question

Quizplus · Accepted Answer

During the micturition reflex, stimulation of stretch receptors in the bladder wall sends impulses to the sacral cord, which triggers contraction of the detrusor muscle and relaxation of the internal and external sphincters. This allows urine to flow out of the bladder and through the urethra. Sympathetic motor neurons do not become active during this reflex. The internal sphincter is not consciously relaxed, but rather reflexively relaxed due to the activation of the parasympathetic nervous system.

During the Micturition Reflex