Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «H»:
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Hormone, mineralocorticoid
Hormone, mineralocorticoid: A group of hormones, the most important
being aldosterone, that regulate the balance of water and electrolytes (ions such as
sodium and potassium) in the body. The mineralocorticoid hormones act specifically on the
tubules of the kidney....
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Hormone, parathormone
Hormone, parathormone: Hormone made by the parathyroid
gland (behind the thyroid gland in the neck). Parathormone (pronounced para-thor-mone) is
critical to calcium and phosphorus balance. Deficiency of parathormone results in
abnormally low calcium in the blood (hypocalcemia). Also call parathyrin....
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Hormone, parathyrin
Hormone, parathyrin: See Hormone, parathormone....
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Hormone, parathyroid
Hormone, parathyroid: See Hormone, parathormone....
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Hormone, progesterone
Hormone, progesterone: A female hormone, progesterone
is the principal progestational hormone. Progestational hormones prepare the uterus (the
womb) to receive and sustain the fertilized egg....
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Hormone, secretin
Hormone, secretin: Hormone made by glands in the small
intestine that stimulates pancreatic secretion. The word "hormone" was coined by
the English physiologists Wm. M. Bayliss and Ernest H. Starling in connection with their
discovery of secretin, the first hormone, in 1902....
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Hormone, T3
Hormone, T3: Triiodothyronine, a thyroid hormone. The
number 3 is usually in subscript....
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Hormone, thyroid
Hormone, thyroid: Chemical substance made by the
thyroid gland which is located in the front of the neck. The thyroid
gland uses iodine to make thyroid hormones. The two most important thyroid hormones are
thyroxine (T4) and triiodothyronine (T3)....
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Hormone, thyroid stimulating (TSH)
Hormone, thyroid stimulating (TSH): A hormone produced by the pituitary gland at the base of the brain in response to signals from the hypothalamus gland in the brain.
TSH promotes the growth of the thyroid gland in the neck and stimulates it to produce more thyroid hormones. When there is an exces...
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Hormone, thyrotropin
Hormone, thyrotropin: A hormone produced by the pituitary gland at the base of the brain in response to signals from the hypothalamus gland in the brain.
The suffix -tropin indicates "an affinity for". Thyrotropin has an affinity for the thyroid. Thyrotropin is known also as thyroid stim...
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Hormone, thyroxine
Hormone, thyroxine: A chemical substance made by the
thyroid gland The thyroid gland uses iodine to make thyroid hormones. Thyroxine (T4), one
of the most important thyroid hormones, has four iodine molecules attached to its
molecular structure....
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Hormone, triiodothyronine
Hormone, triiodothyronine: A hormone made by the
thyroid gland. It has three iodine molecules attached to its
molecular structure. Iodine is naturally found in
seafood, bread, seaweed, and ordinary table salt. Triiodothyronine
is the most powerful thyroid hormone, and affects almost every
proces...
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Hormone, TSH
Hormone, TSH: Stands for Thyroid Stimulating Hormone.
Also known as thyrotropin....
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Hormone,T4
Hormone,T4: Thyroxine....
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Horner syndrome
Horner syndrome: A complex of abnormal findings, namely
sinking in of one eyeball, ipsilateral ptosis (drooping of the upper eyelid on the same
side) and miosis (constriction of the pupil of that eye) together with anhidrosis (lack of
sweating) and flushing of the affected side of the face. Due to p...
