universal donor A person with blood type O, who is able to donate blood to people with other blood types in emergency blood transfusions. universal recipient A person with blood type AB, who can receive blood of any type in emergency transfusions. urea (yoo-re'a) The chief nitrogenous waste product of protein catabolism in the urine, formed in the liver from amino acids.
uremia (yoo-re' me-a) The retention of urea and other products of protein catabolism as a result of inadequate kidney function. urobilinogen (yoo"ro-bi-lin'o-Jen) A compound formed from bilirubin in the intestine. Some is excreted in the feces and some is absorbed and enters the enterohepatic circulation, where it may be excreted either in the bile or in the urine.
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