Question

The flow of urine into the urinary bladder is controlled by sphincters.

• A. True
• B. False

Answer 1

The correct option is B False

$\bullet$ Flow of urine into the urinary bladder is not controlled by sphincters.
$\bullet$ The opening of urinary bladder into urethra is controlled by a pair of sphincters, called upper and lower.
$\bullet$ After the bladder is filled beyond its limit, a pressure is exerted on to the walls of urinary bladder.
$\bullet$ This triggers off an automatic reflex action causing relaxation of the upper sphincter.
$\bullet$ The lower sphincter is regulated by brain.
$\bullet$ When both the sphincters are realxed, micturition happens, resulting in the removal of urine out of the body.