U

ulcer a lesion of the surface of the skin or a mucous membrane; sometimes occurs in the digestive system (988) umbilical cord the structure that connects an embryo and then the fetus to the placenta and through which blood vessels pass (1059) ungulate a hoofed mammal (872) unicellular describes an organism that consists of a single cell (7) urban ecology the study of ecology in areas that are densely populated by humans (452) urea the principal nitrogenous product of the metabolism of proteins that forms in the liver from amino acids and from compounds of ammonia and that is found in urine and other body fluids (993)

ureter one of the two narrow tubes that carry urine from the kidneys to the urinary bladder (997) urethra the tube that carries urine from the urinary bladder to the outside of the body (997)

urinary bladder a hollow, muscular organ that stores urine (997) urine the liquid excreted by the kidneys, stored in the bladder, and passed through the urethra to the outside of the body (994) uropod a flattened posterior appendage in some crustaceans (729) uterus in female mammals, the hollow, muscular organ in which a fertilized egg is embedded and in which the embryo and fetus develop (1052)

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