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Q.

Micturition is facilitated due to

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a

contraction of the internal urethral sphincter

b

relaxation of the internal urethral sphincter

c

contraction of the external urethral sphincter

d

relaxation of smooth muscles of bladder

answer is B.

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Detailed Solution

For the process of micturition(release of urine) the smooth muscles of the urinary bladder contract and internal urethral sphincter relax simultaneously. Internal urethral sphincter is involuntary.

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Micturition is facilitated due to