News tagged with hormone

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

Global toolkit to diagnose menopause

Created at Monash University, the world's first toolkit is designed for GPs to use with women from the age of 40. Thought to be the first of its kind, researchers say the toolkit has the potential to help manage menopausal ...

Jul 06, 2014
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Mutations linked to breast cancer treatment resistance

Researchers at the University of Michigan Comprehensive Cancer Center have identified a type of mutation that develops after breast cancer patients take anti-estrogen therapies. The mutations explain one reason why patients ...

Nov 03, 2013
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Gene linked to low IQ

(Medical Xpress)—Children with both a common gene variant and lower thyroid hormone levels, which occurs in approximately 4% of the population, are four times more likely to have a low IQ, according to ...

Mar 25, 2014
popularity 4.6 / 5 (5) | comments 1

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.

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