One fun fact about the excretory system is that the kidneys receive signals to produce less urine in an effort to preserve hydration when the temperature is hot or there isn't much drinking water available, according to Biology4Kids. When someone consumes too much water, hormones release to make urine production increase.
All of the blood in a person's body cycles through the kidneys approximately 400 times daily, according to Easy Science for Kids. As the blood passes through the kidneys, they filter harmful wastes and excess water out of the bloodstream, notes the National Kidney and Urologic Diseases Information Clearinghouse. The wastes and fluid comprise urine, which then travels out of the kidneys and into the bladder through two ureters.
Once the bladder nears its urine capacity, healthy individuals experience the urge to use the restroom, notes the he National Kidney and Urologic Diseases Information Clearinghouse. The urine then exits the body through the urethra, which is shorter in women than in men.
In addition to the kidneys, bladder, ureters and urethra, the skin and the lungs are also components of the excretory system, explains Monroe County Women's Disability Network. The skin is the human body's biggest organ and releases sweat via perspiration. The lungs release carbon dioxide, another waste product in humans, via the process of respiration.