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bladder an organ inside the body that collects urine. The bladder gets larger when it fills and smaller when it becomes empty.
kidney one of a pair of organs in the body which remove water and waste products from the blood. The waste products go from the kidneys to the bladder in the form of urine. The kidneys are found high in the abdomen near the spine. [1/2 definitions]
penis the male sex organ through which sperm is transferred to a female. The penis is also used to dispose of urine.
urine a substance made by the kidneys to carry waste out of the body. Urine comes out as a yellow liquid in mammals and as a partially solid substance in reptiles and birds.