Assertion : Urinary bladder and ureters are lined by transitional epithelium .
Reason : Ureters carry the urine to urinary bladder where it is stored temporarily .

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) Urinary bladder and ureters of excretory system are lined by transitional epithelium because it is a stretchable epithelium , hence the urinary bladder and ureters may be considerably stretched without getting torn when they are filled with urine . Ureters are thin muscular tubes which emerge from the hilum of each kidney. Urine enters the ureters form the renal pelvis and is conducted along the ureters by peristaltic waves on their walls. Ureters from both the kidneys finally open into urinary bladder which is a hollow muscular sac. In this way urine from both the kidneys is drained into the urinary bladder which stroes it temporarily.