Urination is the release of urine from the urinary bladder through the urethra to the outside of the body. It is the urinary system 's form of excretion. It is also known medically as micturition , voiding , uresis , or, rarely, emiction , and known colloquially by various names including peeing , weeing , and pissing. In healthy humans and many other animals the process of urination is under voluntary control. In infants, some elderly individuals, and those with neurological injury, urination may occur as a reflex.
Most of the time, urine is a pale yellow color because it contains urochrome, one of the substances produced when hemoglobin gets broken down. Hemoglobin is the protein in red blood cells that sticks to oxygen so it can be ferried around the body. Occasionally, though, urine turns a very different color. Men may notice the change as their urine enters the toilet bowl or urinal.
Nobody likes a smelly litterbox. While even the cleanest kitty condo will possess a particular perfume, how can a cat guardian separate stinky from sickly? Litterboxes and modern litter do an excellent job of concealing sight and odor. Water was scarce, so they developed clever systems to maintain hydration.