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Question

Arrange the following micturation events:
(i) Relaxation of the lower sphincter,
(ii) Removal of urine out of the body,
(iii) Relaxation of the upper sphincter,
(iv) The bladder is filled with urine,
(v) Tension in the bladder wall increases.
 
  1. i, iii, iv, ii, v
  2. iii, ii, iv, v, i
  3. iv, ii, iii, i, v
  4. iv, v, iii, i, ii


Solution

The correct option is D iv, v, iii, i, ii
Micturation is the process of excreting urine out of the body.
Urine is produced by the kidney and transported to the urinary bladder by a pair of ureters.
Urinary bladder can store 300-800 mL of urine.
After the bladder is filled, the pressure is exerted on to the walls of the urinary bladder.
Urinary bladder has two sphincters, upper and lower.
Pressure on the wall of the bladder triggers off an automatic reflex action causing relaxation of the upper sphincter.
The lower sphincter is regulated by the brain.
When both the sphincters are relaxed micturation happens, resulting in the removal of urine out of the body.

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