Question

what is the sympathetic nervous system responsible for in the micturition reflex? relaxing the detrusor muscle and contracting the sphincter muscle. relaxing both the detrusor muscle and sphincter muscle. contracting the detrusor muscle and relaxing the sphincter muscle. contracting both the detrusor muscle and sphincter muscle. activating the kidneys to produce urine.

Explanation:

The sympathetic nervous system is part of the autonomic nervous system. In the micturition (urination) reflex, its role is related to the control of the detrusor muscle (in the bladder) and the sphincter muscle (around the urethra). The sympathetic nervous system relaxes the detrusor muscle (so the bladder can store urine) and contracts the internal urethral sphincter (to prevent urine from flowing out).

Answer:

Relaxing the detrusor muscle and contracting the sphincter muscle.