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The outline of principal event of urination is given below in unordered manner -
I. Stretch receptors on the wall of urinary bladder send signal to the CNS
II. The bladder fills with urine and becomes distended
IH. 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 -
(a) \( \mathrm{I} \rightarrow \mathrm{II} \rightarrow \mathrm{III} \rightarrow \mathrm{IV} \)
(b) \( \mathrm{IV} \rightarrow \mathrm{II} \rightarrow \mathrm{II} \rightarrow \mathrm{I} \)
(c) \( \mathrm{II} \rightarrow \mathrm{I} \rightarrow \mathrm{IV} \rightarrow \mathrm{III} \)
(d) \( \mathrm{III} \rightarrow \mathrm{II} \rightarrow \mathrm{I} \rightarrow \mathrm{IV} \)
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