Assertion: During micturition, urine is prevented from flowing back into the ureters.
Reason: Urethral sphincters contract during micturition

Options

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C. If the assertion is true but the reason is false
D. If both the assertion and reason are false

Answer

C

Explanation

The process of release of urine is called micturition. When enough urine is collected in bladder sphincter present on the neck of bladder stimulate smooth muscles of the bladder wall to contract and the urethral sphincter which guard the urethra to relax. But it is prevented form flowing back into the ureter because the terminal part of each ureter passes obliquely through the bladder wall and is consequently closed due to compression by the contracting bladder muscles.