umbilical cord um-BIL-ik-kel KORD A ropelike structure that contains one vein and two arteries that connects a pregnant female placental mammal to unborn offspring. 216
unconditioned stimulus A stimulus that normally triggers a particular response. 815
uniramous uni-RAY-muss A single-lobed arthropod appendage. 522
unsaturated un-SAT-yur-RAY-tid (fat) A triglyceride with double bonds between some of its carbons. 45
upwelling Upward movement of nutrient-rich lower layers of a body of water. 883
uracil YUR-eh-sil One of two pyrimidine bases in RNA. 51
urea u-REE-ah A nitrogenous waste derived from ammonia. 776
ureter YEW-re-ter A muscular tube that transports urine from the kidney to the bladder. 780
urethra u-RETH-rah Tube that transports urine from the bladder out of the body. 197, 780
uric acid YOUR-ik AS-id A nitrogenous waste derived from ammonia. 776
urinary bladder YOUR-en-air-ee BLAD-er A muscular sac where urine collects. 780
uterus U-ter-us The muscular, saclike organ in a female placental mammal where the embryo and fetus develop. 197
utricle U-trah-kel A pouch in the vestibule of the inner ear filled with a jellylike fluid and lined with hair cells that contain calcium carbonate granules that move in response to changes in velocity, firing action potentials. 655
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