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Glossary

Showing 1121-1130 out of 1202 Terms

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  • Thyroid hormone

    (THY-royd HOR-mone)

    A hormone that affects heart rate, blood pressure, body temperature, and weight. Thyroid hormone is made by the thyroid gland and can also be made in the laboratory.

  • Thyroid stimulating hormone

    (THY-royd STIM-yoo-LAY-ting HOR-mone)

    A hormone produced by the pituitary gland. Thyroid-stimulating hormone stimulates the release of thyroid hormone from thyroglobulin. It also stimulates the growth of thyroid follicular cells. An abnormal thyroid-stimulating hormone level may mean that the thyroid hormonal regulation system is out of control, usually as a result of a benign condition (hyperthyroidism or hypothyroidism).

  • Thyroxine

    (thy-ROK-seen)

    A hormone that is made by the thyroid gland and contains iodine. Thyroxine increases the rate of chemical reactions in cells and helps control growth and development. Thyroxine can also be made in the laboratory and is used to treat thyroid disorders. Also called L-3,5,5’-tetraiodothyronine, T4, and thyroxin.

  • Tinnitus

    (tih-NY-tus)

    Ringing in your ears.

  • Tissue

    A group or layer of cells that work together to perform a specific function.

  • Tonsils

    (TON-sil)

    Two small masses of lymphoid tissue on either side of the throat.

  • Toxicity

    (tok-SIH-sih-tee)

    The extent to which something is poisonous or harmful.

  • Toxins

    A poison made by certain bacteria, plants, or animals, including insects.

  • Tracer

    TRAY-ser

    A substance (such as a radioisotope) used in imaging procedures.

  • Trachea

    (TRAY-kee-uh)

    The airway that leads from the larynx (voice box) to the bronchi (large airways that lead to the lungs). Also called windpipe.