Why Do We Get Dizzy ?

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Offline neilep

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Why Do We Get Dizzy ?
« on: 13/07/2008 20:39:02 »
Dear All,

Feeling queezy ?....eaten too much ?....are ewe drunk ?


Then don't look at these !

[attachment=3699]

[attachment=3701]




Gosh..if you're ill..I hope ewe didn't look at them !!


Why do we get dizzy ?....why specifically do we get dizzy when spinning ?...and does closing your eyes when spinning have any effect on the dizziness ?........actually, we only feel the effect of the dizziness when we have stopped spinning don't we ?


Thanking Ewe



neil
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Offline RD

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Why Do We Get Dizzy ?
« Reply #1 on: 13/07/2008 20:48:12 »
The vertigo is caused by fluid (endolymph) sloshing about in your semicircular canals...
http://en.wikipedia.org/wiki/Semicircular_canal

There is a reflex action of vertigo triggering vomiting because vertigo can be a symptom of poisoning,
(if you have eaten a poisonous substance then it may be beneficial to regurgitate the contents of your stomach).
« Last Edit: 13/07/2008 21:24:43 by RD »

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Offline Karen W.

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Why Do We Get Dizzy ?
« Reply #2 on: 14/07/2008 03:12:18 »
ewwwwwwwweeee...

Those do not make me sick.. YAYYYYYYY!

Semicircular canals? You are referring to ears or ear drums eh?

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Offline Karen W.

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Why Do We Get Dizzy ?
« Reply #3 on: 14/07/2008 03:12:54 »
I always heard that inner ear infections could cause vertigo...

"Life is not measured by the number of Breaths we take, but by the moments that take our breath away."

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Offline neilep

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Why Do We Get Dizzy ?
« Reply #4 on: 14/07/2008 15:59:37 »
Thanks RD

But how does something like some liquid in your ear cause a visual disturbance ?

 
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Offline RD

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Why Do We Get Dizzy ?
« Reply #5 on: 14/07/2008 17:26:51 »
Visual information can conflict with balance information from the inner ear, e.g. motion sickness....

Quote
The most common hypothesis for the cause of motion sickness is that it functions as a defense mechanism against neurotoxins. The area postrema in the brain is responsible for inducing vomiting when poisons are detected, and for resolving conflicts between vision and balance. When feeling motion but not seeing it (for example, in a ship with no windows), the inner ear transmits to the brain that it senses motion, but the eyes tell the brain that everything is still. As a result of the disconcordance, the brain will come to the conclusion that one of them is hallucinating and further conclude that the hallucination is due to poison ingestion. The brain responds by inducing vomiting, to clear the supposed toxin.
http://en.wikipedia.org/wiki/Motion_sickness