Question

what is the parasympathetic nervous system responsible for in the micturition reflex? relaxing the detrusor muscle and contracting the sphincter muscle. activating the sympathetic nervous system and inhibiting the parasympathetic nervous system. contracting both the detrusor muscle and sphincter muscle. relaxing both the detrusor muscle and sphincter muscle. contracting the detrusor muscle and relaxing the sphincter muscle.

Explanation:

The parasympathetic nervous system is responsible for promoting "rest - and - digest" functions. In the micturition (urination) reflex, the detrusor muscle (which contracts to expel urine from the bladder) is contracted by the parasympathetic nervous system, and the internal urethral sphincter (a smooth muscle) is relaxed by the parasympathetic nervous system to allow urine flow.

Answer:

Contracting the detrusor muscle and relaxing the sphincter muscle.