HOME >> BIOLOGY >> NEWS
Why nerve cells work faster than the theory allows

With accuracy unknown until now, researchers from the Max Planck Institute for Dynamics and Self-Organization and the Bernstein Center for Computational Neuroscience in Gttingen together with the neurophysiologist Maxim Volgushev from the Ruhr-Universitt Bochum have analyzed, by which rules, the nerve cells in the cerebral cortex decide to send out impulses. They surprisingly found, that the high flexibility and speed with which these cells work cannot be explained using the present, central model of neurophysiology, the Hodgkin-Huxley model. Their findings suggest that the sodium channels, which open in the cell membranes during a nerve impulse, do not work independently of each other, as assumed so far, but support each other during the opening process. This new type of mechanism appears to help the cells transmit fast changing signals and suppress slow signals.

(Nature, Volume 440, Number 7087, 2006)

Every living cell maintains a voltage difference across its cell membrane. Nerve cells distinguish themselves from other cells in that they use this voltage difference to process and transmit messages. When a nerve cell receives an impulse, the voltage across the cell membrane is reversed. This "action potential" spreads out through the long appendages of the cell with high speed. At the end of the appendages it is transmitted to other cells. In 1952, Alan Lloyd Hodgkin and Andrew Fielding Huxley described in a mathematical model how such an action potential originates on the basis of measurements on neurons of the squid. The Hodgkin-Huxley model, for which the scientists later received the Nobel Prize, has since then served to explain the signal processes in all neurons.

According to the Hodgkin-Huxley model, an action potential is initiated when the voltage across the membrane of the nerve cell reaches to a certain threshold value. Voltage gated sodium channels react to this voltage change by opening up and triggering an avalanche-like reactio
'"/>

Contact: Dr. Fred Wolf
fred@chaos.gwdg.de
49-551-517-6423
Max-Planck-Gesellschaft
19-Apr-2006


Page: 1 2 3 4

Related biology news :

1. Natures weapon against nerve agents
2. Autism-related proteins control nerve excitability, researchers find
3. Gene therapy delivery of nerve growth factors reverses erectile dysfunction in animal model
4. Studies assess effectiveness of serotonin and nerve stimulants on irritable bowel syndromes
5. Growing nerve cells in 3-D dramatically affects gene expression
6. Study revises dynamins role in nerve cell function
7. Antidepressants stimulate new nerve cells in adult monkeys, may have implications for humans
8. Scientists identify key to integrating transplanted nerve cells into injured tissue
9. Deactivating protein may protect nerve fibers in MS
10. 3 proteins may play important role in nerve-cell repair
11. Stress and nerve cells survival in rats; finding may open window for depression treatment

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/27/2017)... ROCKVILLE CENTRE, N.Y. , March 27, 2017 ... by Healthcare Information and Management Systems Society (HIMSS) ... Analytics Outpatient EMR Adoption Model sm . In ... top 12% of U.S. hospitals using an electronic ... recognized CHS for its high level of EMR ...
(Date:3/23/2017)... 23, 2017 The report "Gesture Recognition and Touchless Sensing ... Geography - Global Forecast to 2022", published by MarketsandMarkets, the market is expected ... 29.63% between 2017 and 2022. Continue Reading ... ... ...
(Date:3/22/2017)... March 21, 2017 Optimove , ... by retailers such as 1-800-Flowers and AdoreMe, today ... Recommendations and Replenishment. Using Optimove,s machine learning algorithms, ... product and replenishment recommendations to their customers based ... predictions of customer intent drawn from a complex ...
Breaking Biology News(10 mins):
(Date:8/15/2017)... ... August 15, 2017 , ... Kenall, ... modular downlights designed to stay tightly sealed and perform efficiently for years. The ... wet location listings just aren't enough, such as: hospitals; behavioral health facilities; cleanrooms; ...
(Date:8/14/2017)... Portland, Oregon (PRWEB) , ... August 14, 2017 ... ... modules that provide essential device-to-computer interconnect using USB or PCI Express, announced the ... hardware. , SYZYGY is intended to satisfy the need for a compact, low ...
(Date:8/11/2017)... Wauwatosa, WI (PRWEB) , ... August 11, 2017 ... ... transparency in food production, and, in particular, more natural alternatives to synthetic ingredients,” ... and innovation of Third Wave, with the established manufacturing presence and know-how of ...
(Date:8/10/2017)... ... August 09, 2017 , ... Okyanos Center for Regenerative Medicine ... the Pelican Bay Hotel in Freeport, Grand Bahama on September 27, 2017. This daytime ... , With oversight from the Ministry of Health’s National Stem Cell Ethics Committee (NSCEC) ...
Breaking Biology Technology:
Cached News: