News tagged with hormone

Related topics: breast cancer , women , plants , estrogen , protein

Anti-ageing hormone receptors

(Medical Xpress)—A reduced caloric intake increases life expectancy in many species. But how diet prolongs the lives of model organisms such as fruit flies and roundworms has remained a mystery until recently.

Aug 07, 2013
popularity 4.8 / 5 (5) | comments 0 | with audio podcast

Legalise doping or lose the spectacle of sport

Sport, at both international and local levels, seems to constantly be in a doping crisis. It may be time to consider legalising performance enhancers because zero tolerance is clearly not working.

Jul 17, 2013
popularity 3.3 / 5 (7) | comments 7 | with audio podcast

Hormone

Hormones (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.

This text uses material from Wikipedia licensed under CC BY-SA