Question

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

Explanation:

The parasympathetic nervous system is responsible for the contraction of the detrusor muscle (which helps in emptying the bladder) and relaxation of the internal sphincter muscle (to allow urine flow) during the micturition reflex.

Answer:

Contracting the detrusor muscle and relaxing the sphincter muscle.