What is hormone?

  • (noun): The secretion of an endocrine gland that is transmitted by the blood to the tissue on which it has a specific effect.
    Synonyms: endocrine, internal secretion


A hormone (from Greek ὁρμή, "impetus") is a chemical released by a cell or a gland in one part of the body that sends out messages that affect cells in other parts of the organism. Only a little amount of hormone is required to alter cell metabolism. In essence, it is a chemical messenger that transports a signal from one cell to another. All multicellular organisms produce hormones; plant hormones are also called phytohormones. Hormones in animals are often transported in the blood. Cells respond to a hormone when they express a specific receptor for that hormone. The hormone binds to the receptor protein, resulting in the activation of a signal transduction mechanism that ultimately leads to cell type-specific responses.

Read more about Hormone.

Some articles on hormone:

LG Life Sciences
... human growth hormone Eutropin(1993) - rhFSH (recombinant human follicle stimulating hormone) Follitrope(2006) - SR-hGH (Sustained Release-human Growth Hormone ...
... SM-130,686 is a drug which acts as a potent, orally active growth hormone secretagogue, with around half the potency of the endogenous agonist ghrelin as a stimulator of growth hormone release ... and is under investigation for the treatment of growth hormone deficiency and other medical conditions ... urine tests for SM-130,686 and other growth hormone secretagogues, even though no drugs from this class have yet progressed to clinical use ...
Cameron Inquiry - Background
... In May 2005 Eastern Health discovered errors in hormone receptor breast cancer test results from a histology lab in St Johns, Newfoundland ... The tests were designed to register patients' hormone levels, and determine whether they could benefit from potentially life-saving hormone oncology ... board held a series of media briefings on the hormone receptor test errors, downplaying the seriousness and extent of the problems ...
Luteinizing Hormone Beta Polypeptide
... Gene Ontology Molecular function • receptor binding • hormone activity Cellular component • extracellular region Biological process • progesterone biosynthetic process ...