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The outline of principal event of urination is given
Page no. - 297, 298
\( \mathrm{P} \)
below in unorder manner
W
I. Stretch receptors on the wall of urinary bladder send signal to the CNS
II. The bladder fills with urine and becomes distended
III. Micturition
IV. CNS passes on motor messages to initiate the contraction of smooth muscles of bladder and simultaneous relaxation of urethral sphincter

The correct order of steps for urination is
(1) \( \quad \) II \( \rightarrow \) I \( \rightarrow \) IV \( \rightarrow \) III
(2) \( \quad \) IV \( \rightarrow \) III \( \rightarrow \) II \( \rightarrow \) I
(3) \( \quad \) II \( \rightarrow \) I \( \rightarrow \) III \( \rightarrow \) IV
(4) \( \quad \) III \( \rightarrow \) II \( \rightarrow \) I \( \rightarrow \) IV
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