Question

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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.
activating the kidneys to produce urine.
contracting both the detrusor muscle and sphincter muscle.

Explanation:

The sympathetic nervous system is part of the autonomic nervous system. In the micturition (urination) reflex, its role is to relax the detrusor muscle (in the bladder wall) and contract the internal urethral sphincter. This helps in storing urine (opposing the act of urination). The detrusor contraction and sphincter relaxation (options related to that) are more related to the parasympathetic nervous system (which promotes urination). The kidneys produce urine continuously, not in an activated - by - sympathetic - for - micturition way.

Answer:

Relaxing the detrusor muscle and contracting the sphincter muscle.