Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «H»:
Horace Barker: See: Barker, Horace Albert....
Horizontal: In anatomy, a plane passing through the standing body. A person lying on a bed is considered in a horizontal position.
For a more complete listing of terms used in medicine for spatial orientation, please see the entry to "Anatomic Orientation Terms"....
Hormone: A chemical substance produced in the body
that controls and regulates the activity of certain cells or organs.
Many hormones are secreted by specialized glands such as the thyroid gland. Hormones are essential for every activity of daily living, including the processes of digestion, metab...
Hormone therapy: A form of treatment that takes advantage of the fact that certain cancers depend on hormones to grow. Hormone therapy may include giving hormones to the patient or decreasing the level of hormones in the body....
Hormone therapy (HT)
Hormone therapy (HT) or hormone
replacement therapy (HRT): The combination therapy of estrogen plus a
progestogen. Formerly, hormone replacement therapy
Estrogen therapy (ET) is used to treat the symptoms of
menopause. It reduces
or stops the short-term changes of menopause such as hot...
Hormone, aldosterone: A hormone made by the outer portion
(cortex) of the adrenal gland that regulates the balance of salt and water in the body. Pronounced AL·do·ste·rone.
Aldosterone is secreted in response to low salt levels. Aldosterone then activates the MR (for mineralocor...
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Hormone, androgenic: Any hormone that pr...
Hormone, antidiuretic (ADH)
Hormone, antidiuretic (ADH): A relatively small
(peptide) molecule that is
released by the pituitary gland at the base of the brain
after being made
nearby (in the hypothalamus). ADH has an antidiuretic
action that prevents
the production of dilute urine (and so is antidiuretic).
Hormone, cortisol: The primary stress hormone. Cortisol
is the major natural glucocorticoid in humans....
Hormone, erythropoietin: Erythropoietin is a substance produced by the kidney that leads to the formation of red blood cells in the bone marrow. Abbreviated: EPO.
The kidney cells that make EPO are specialized and are
sensitive to low oxygen levels in the blood coming into the kidney. These cells r...
Hormone, estrogenic: A female hormone produced by the
ovaries (or an equivalent hormone synthesized in the laboratory). Estrogen deficiency can
lead to osteoporosis. ...
Hormone, follicle-stimulating (FSH)
Hormone, follicle-stimulating (FSH): A hormone
produced by the pituitary
gland that controls estrogen production by the ovaries....
Hormone, glucocorticoid: A hormone that predominantly
affects the metabolism of carbohydrates and, to a lesser extent, fats and proteins (and has
other effects). Glucocorticoids are made in the outside portion (the cortex) of the
adrenal gland and chemically classed as steroids. Cortisol is the majo...
Hormone, growth: A hormone made in the pituitary gland that stimulates the release of another hormone called somatomedin by the liver, thereby causing growth. Growth hormone is synonymous with somatotropin and somatropin.
More specifically (and technically), growth hormone is produced by the anteri...
Hormone, human chorionic gonadotropin
Hormone, human chorionic gonadotropin: See: Human chorionic gonadotropin....