The Ureter is a tube which carries urine from the kidney to the bladder.
Urine passes down the tube, with the help of gravity and several waves of contractions.
The urinary bladder is a muscular sac in the pelvis.
The bladder stores urine, allowing urination to be frequent and voluntary. As urine enters the bladder, it stretches to accommodate. It normally stores 400 to 600 ml of urine.
During urination the bladder contracts and urine passes into the urethra.
Bladder
Urethra
The Urethra is a tube that connects the urinary bladder to the outside of the body.
In males the urethra is a passage for semen during sexual intercourse as well as a passage for urine.
In females the urethra is shorter and emerges above the vaginal opening.