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| | N || O || P || Q || R || S || T || U || V || W || X || Y ||
Z | Ulcer - an open sore on the skin surface or on the stomach
lining. Ulcerative colitis - a serious disease that causes
ulcers and irritation in the inner lining of the colon and
rectum. Ulnar bone - the longer of the two bones in the forearm.
Ultrasound (Also called sonography.) - a diagnostic imaging
technique which uses high-frequency sound waves and a computer
to create images of blood vessels, tissues, and organs.
Ultrasounds are used to view internal organs as they function,
and to assess blood flow through various vessels. Ultraviolet
radiation - invisible light rays that come from the sun.
Ultraviolet radiation can damage the skin and cause melanoma and
other types of skin cancer. Umbilical cord - a rope-like cord
connecting the fetus to the placenta. The umbilical cord
contains two arteries and a vein, which carry oxygen and
nutrients to the fetus and waste products away f