Related topics: women , estrogen
Hormone
hideHormones (from Greek ὁρμή - "impetus") are chemicals released by cells that affect cells in other parts of the body. Only a small amount of hormone is required to alter cell metabolism. It is essentially 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.
Endocrine hormone molecules are secreted (released) directly into the bloodstream, while exocrine hormones (or ectohormones) are secreted directly into a duct, and from the duct they either flow into the bloodstream or they flow from cell to cell by diffusion in a process known as paracrine signalling.
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News tagged with hormone
Multiple sclerosis successfully reversed in animals
Aug 11, 2009 |
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(PhysOrg.com) -- A new experimental treatment for multiple sclerosis (MS) completely reverses the devastating autoimmune disorder in mice, and might work exactly the same way in humans, say researchers at ...
Muscle: 'Hard to build, easy to lose' as you age
Sep 11, 2009 |
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(PhysOrg.com) -- Have you ever noticed that people have thinner arms and legs as they get older? As we age it becomes harder to keep our muscles healthy. They get smaller, which decreases strength and increases the likelihood ...
Mayo researchers: Dramatic outcomes in prostate cancer study
Jun 19, 2009 |
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Two Mayo Clinic patients whose prostate cancer had been considered inoperable are now cancer free thanks in part to an experimental drug therapy that was used in combination with standardized hormone treatment and radiation ...
Testosterone does not induce aggression
Medicine & Health / Neuroscience
Dec 08, 2009 |
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New scientific evidence refutes the preconception that testosterone causes aggressive, egocentric, and risky behavior. A study at the Universities of Zurich and Royal Holloway London with more than 120 experimental subjects ...
Study strengthens link between sirtuins proteins and life extension
Dec 14, 2009 |
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(PhysOrg.com) -- A new paper from MIT biology professor Leonard Guarente strengthens the link between longevity proteins called sirtuins and the lifespan-extending effects of calorie restriction.
An anti-frailty pill for seniors?
Nov 04, 2008 |
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Researchers at the University of Virginia Health System report that a daily single oral dose of an investigational drug, MK-677, increased muscle mass in the arms and legs of healthy older adults without serious side effects, ...
Scientists reveal secrets of drought resistance
Oct 22, 2009 |
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A team of biologists in California led by researchers at The Scripps Research Institute and the University of California, San Diego has solved the structure of a critical molecule that helps plants survive during droughts. ...
At Long Last, How Plants Make Eggs
Jun 04, 2009 |
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(PhysOrg.com) -- A long-standing mystery surrounding a fundamental process in plant biology has been solved by a team of scientists at the University of California, Davis.
Ice cream may target the brain before your hips, study suggests
Sep 14, 2009 |
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Blame your brain for sabotaging your efforts to get back on track after splurging on an extra scoop of ice cream or that second burger during Friday night's football game.
Growth hormone's link to starvation may be clue to increasing life span
Jun 28, 2008 |
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Researchers at UT Southwestern Medical Center have determined that starvation blocks the effects of growth hormone via a mechanism that may have implications in treating diabetes and extending life span.
Presidential election outcome changed voters' testosterone
Oct 20, 2009 |
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(PhysOrg.com) -- Young men who voted for Republican John McCain or Libertarian candidate Robert Barr in the 2008 presidential election suffered an immediate drop in testosterone when the election results were ...
Scientists try to stop schizophrenia in its tracks
Jul 26, 2009 |
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(AP) -- She was sociable and happy in high school. But in college that changed abruptly: Depressed and withdrawn, some days she couldn't get out of bed. And that wasn't all.
Laughter remains good medicine
Medicine & Health / Psychology & Psychiatry
Apr 17, 2009 |
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The connection between the body, mind and spirit has been the subject of conventional scientific inquiry for some 20 years. The notion that psychosocial and societal considerations have a role in maintaining health and preventing ...
When eating and dieting, follow your gut
Jul 29, 2009 |
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(PhysOrg.com) -- Eating a small lunch doesn’t necessarily mean you’ll be so hungry for dinner that you’ll eat more than usual, a new study suggests.
Study: When/if to start hormones for prostate cancer patients whose PSA rises after radiation
Sep 23, 2008 |
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A new Fox Chase Cancer Center study suggests men with early stage prostate cancer treated with radiation therapy should begin hormone therapy immediately if their PSA level rises quickly and doubles within six months at any ...
