Question

21. Name the passage in sequence through which urine passes from kidneys to the outside
in humans. How is urine prevented from flowing back into the ureters? (2 marks)
kidney -> the urinary bladder -> the urethra ----> outside
There are valves present in ureters called as ureterovesical valves which prevent the
backflow of urine.​

Answer 1

Answer:

what do you want to know

Explanation:

you have describe there .