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Thrombin is a substance (enzyme) in the bloodstream that is needed for blood to clot. When a person is cut or wounded, thrombin

A transplant rejection is the body's destruction of a newly introduced organ or tissue. A person's immune system does not

A transcutaneous blood oxygen monitor is used to help doctors find out whether a person needs supplemental oxygen or an adjustment

A teratogen is any substance or process that may interfere with the normal development of a fetus or cause birth defects

The tailbone (coccyx) is the small bone at the bottom of the spine. It is attached to the triangular-shaped sacral bone above it

The tonsils and adenoids are made of lymph tissue in the throat. They help make substances called antibodies that help the body

Trismus is a condition in which one of the jaw muscles tightens or spasms, holding the mouth shut. A person with trismus has

Testicles (testes) are a pair of oval organs that produce sperm and the male hormone testosterone. The testicles are located in

Tears are produced by the lacrimal glands to keep the eye moist and to wash away dust, dirt, germs, and other irritating

Tentacles are long, slender, flexible growths found on jellyfish, Portuguese man-of-wars, squid, and octopuses. Tentacles are used