How Brain Knows When Body 'Hits the Wall'


	How Brain Knows When Body 'Hits the Wall'

wildcat

7-11-2007 6:38 AM

836 views

tags:

science, brain, norepinephrine, hormones, hindbrain

2 Comments |

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7-11-2007 7:03 AM

debbyski

I think I hit the wall last night Wildcat.

7-11-2007 9:04 PM

k9riley99

Wildcat:

Doomed, doomed, doomed; getting used to Hitting that Wall.

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/2694292f-27f1-42c7-891e-9f2927b16b2c/C636023E-9F8A-4FDA-A778-C0E7D8ED7E66/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.livescience.com/health/070710_low_bloodsugar.html" href="http://www.livescience.com/health/070710_low_bloodsugar.html" style="font-size: 11px;">www.livescience.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.livescience.com/health/070710_low_bloodsugar.html"><DIV>
Scientists have pinned down a chemical signal that gives that sudden feeling that you've hit the wall and need candy now. </DIV></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.livescience.com/health/070710_low_bloodsugar.html"><DIV>
Norepinephrine was previously known to operate as a stress hormone as well as a neurotransmitter that plays a role in mood regulation and other physical processes, but the new research makes clear that it's also the final chemical step in warning the brain that it's <A href="http://www.livescience.com/php/video/player.php?video_id=pur1351_fathungrybrain">out of gas</A>.</DIV></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.livescience.com/health/070710_low_bloodsugar.html"><DIV>
USC neuroscientist Arshad Khan and his colleagues found that norepinephrine travels from the hindbrain, which receives warnings of low glucose levels, to a brain region called the paraventricular hypothalamus. There, the norepinephrine authorizes the consumption of energy stores to replace the missing sugars. </DIV></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.livescience.com/health/070710_low_bloodsugar.html"><DIV>
Khan told <EM>LiveScience</EM> that the chemical works like a <A href="http://www.livescience.com/health/050104_brain_internet.html">middle man</A>  in the signaling, which ends with the pituitary gland releasing hormones into the bloodstream that allow cells to dip into the body's reserve energy tank. </DIV></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/C636023E-9F8A-4FDA-A778-C0E7D8ED7E66/blog/" title="blog or email this clip"><img src="http://content7.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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