The urogenital opening is where waste products of the body and reproductive fluids are expelled to the environment outside of the body cavity. In some organisms, including birds and many fish, discharge from the urological, digestive, and reproductive systems empty into a common sac called the cloaca. In many organisms, these three systems are more separated. In the human female, separate orifices have evolved for all three, while in the male, a common "urogenital orifice" discharges both urinary and reproductive fluids from the urethra.
Famous quotes containing the word opening:
“His leanings were strictly lyrical, descriptions of nature and emotions came to him with surprising facility, but on the other hand he had a lot of trouble with routine items, such as, for instance, the opening and closing of doors, or shaking hands when there were numerous characters in a room, and one person or two persons saluted many people.”
—Vladimir Nabokov (1899–1977)