Micturition reflex does not involve

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contraction of urethral sphincter

voluntary signals of CNS

contraction of smooth muscles of the urinary bladder

stretch receptors of urinary bladder

answer is C.

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Detailed Solution

During micturition, the urethral sphincter muscle is relaxed, specifically the internal urethral sphincter through the micturition reflex and the voluntary external urethral sphincter. This relaxation allows urine to flow from the bladder through the urethra and out of the body, completing the process of urination.

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