Question

The outline of principal events of urination is given in random manner.

(1) Stretch receptors on the wall of urinary bladder send signals to the CNS.

(2) The bladder fills with urine.

(3) Micturition

(4) CNS passes on motor messages to initiate the contraction of smooth muscles of bladder and simultaneous

relaxation of sphincter. The correct sequence of the event is:

• A. 1, 2,3,4
• B. 4,3,2,1
• C. 2,1,4,3
• D. 3,2,1,4

Answer 1

The correct option is C

2,1,4,3

The bladder fills with urine. $\to$ Stretch receptors on the wall of urinary bladder send signals to the CNS. $\to$

CNS passes on motor messages to initiate the contraction of smooth muscles of bladder and simultaneous

relaxation of sphincter. $\to$ Micturition