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During micturition, urine is passed out by

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contraction of detrusor muscles by sympathetic stimulation

relaxation of urethral sphincters by sympathetic stimulation

contraction of external urethral sphincters

contraction of detrusor muscles and relaxation of sphincters by parasympathetic stimulation

answer is D.

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Detailed Solution

The CNS passes on motor messages through parasympathetic system, initiate the contraction of smooth muscles (detrusor muscles) of the urinary bladder and simultaneous relaxation of the urethral sphincter results the release of urine.

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