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 the reason are true and 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

B

Explanation

(b) The acts of voiding the urice is called micturition . Beside functioning as a temporary reservoir of urine, the urinary bladder also evacuates the urine by the proscess of micturiton at suitable intervals. When enough urine has accumlated in the baldder to distend the bladder and raise its pressure sufficiently, a spontaneous nervous activity (reflex) is initiated, this causes the smooth muscles on the bladder wall to constant and the urethal sphicters , which gurad the urethra, to relax. Urine consequently flows from the blabber through the urethra to the exterior. But it is prevented from flowing back into the ureters, obliquely throught the bladdre wall and is conseuently flows from the blabber through the urethral to the exteior. But it is prevented from flowing back into the ureter, becomes the terminal part of each ureter passes obliquely through the baldder wall and is constracting baldder muscles.