Q.

Micturition reflex does not involve

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a

stretch receptors of urinary bladder

b

voluntary signals of CNS

c

contraction of urethral sphincter

d

contraction of smooth muscles of the 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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