thyroxine
Definition
- Noun:
- A hormone produced by the thyroid gland: Thyroxine is the main hormone secreted by the thyroid gland. Its primary function is to regulate the body's metabolism by controlling the rate of cellular oxidation and energy production. Chemically, it is an iodine-containing compound.
Usage and Examples
- Noun:
- The doctor prescribed synthetic thyroxine to treat her hypothyroidism.
- A deficiency in thyroxine can lead to symptoms like fatigue and weight gain.
- The test measures the level of thyroxine in the blood.
Advanced Usage
- "Free thyroxine (FT4)": This refers to the fraction of thyroxine in the blood that is not bound to proteins and is biologically active. It is a more accurate indicator of thyroid function than total thyroxine.
- The endocrinologist ordered a free thyroxine test for a precise diagnosis.
Variants and Related Words
- Thyroxin: An alternative spelling for thyroxine.
- T4: A common abbreviation for thyroxine, referring to its chemical structure which contains four iodine atoms.
- Levothyroxine: The synthetic form of thyroxine used as medication.
- Levothyroxine is commonly used for thyroid hormone replacement therapy.
Synonyms
- Tetraiodothyronine: The full chemical name for thyroxine.
Notes on Meaning
- Thyroxine is specifically an iodine-based hormone. A significant portion (approximately 65%) of its molecular weight is iodine, which is why iodine is an essential nutrient for thyroid health.
Noun
-
hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells
-
thyroxine is 65% iodine
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