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ultratrace element (ul'trah-traIs el'ei-ment) Basic chemical substance needed in very small quantity. p. 39 umbilical cord (um-bil'i-kal kord) Cordlike structure that connects the fetus to the placenta. p. 950 umbilical region (um-bil'i-kal re'jun) The central portion of the abdomen. p. 22 umbilicus (um-bil'i-kus) Region to which the umbilical cord was attached; the navel. p. 950

unipolar neuron (un"i-po'lar nu'ron) A neuron that has a single nerve fiber extending from its cell body. p. 369 unsaturated fat (un-sat'u-rat"ed fat) Organic compound that includes a fatty acid molecule that has one or more double bonds between the atoms of its carbon chain. p. 51 upper limb (uh'per lim) The superior appendage consisting of the arm, forearm, wrist, and hand. p. 212 urea (u-re'ah) A nonprotein nitrogenous substance produced as a result of protein metabolism. p. 743 ureter (u-re'ter) A muscular tube that carries urine from the kidney to the urinary bladder. p. 843 urethra (u-re'thrah) Tube leading from the urinary bladder to the outside of the body. p. 846

uric acid (u'rik as'id) Product of nucleic acid metabolism in the body. p. 842 urine (u'rin) Wastes and excess water removed from the blood and excreted by the kidneys into the ureters to the urinary bladder and out of the body through the urethra. p. 842 uterine (u'ter-in) Pertaining to the uterus. p. 902

uterine tube (u'ter-in tuIb) Tube that extends from the uterus on each side toward an ovary and transports sex cells; fallopian tube or oviduct. p. 902 uterus (u'ter-us) Hollow muscular organ within the female pelvis in which a fetus develops. p. 903

utricle (u'tri-kl) An enlarged portion of the membranous labyrinth of the inner ear. p. 475

uvula (u'vu-lah) A fleshy portion of the soft palate that hangs down above the root of the tongue. p. 691

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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