Crear
Sphincter
Excretory system
Ureters
kidneys
Bladder
Urethra
muscle helps you to stop pee for some time.
tubes that carry the urine from each kidney to the bladder
this system expels waste from the body.
filters that take the waste out of the blood and make pee.
a sac that collects the pee.
a tube that carries the pee from the bladder out of the body.