Why do you see spots when you get up too fast?

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Kierstin Johnson

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Why do you see spots when you get up too fast?
« on: 10/03/2011 12:30:02 »
Kierstin Johnson  asked the Naked Scientists:
   
Why do you see spots when you get up too fast?

Kierstin

What do you think?
« Last Edit: 10/03/2011 12:30:02 by _system »

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Offline techmind

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Why do you see spots when you get up too fast?
« Reply #1 on: 13/03/2011 18:33:44 »
I've always been told this is due to the bloo
Kierstin Johnson  asked the Naked Scientists:
   
Why do you see spots when you get up too fast?

I've always been told this is caused by a drop in blood pressure in the head when you get up suddenly. I guess it's going to be more likely to happen if you already have borderline-low blood pressure to start with...
"It has been said that the primary function of schools is to impart enough facts to make children stop asking questions. Some, with whom the schools do not succeed, become scientists." - Schmidt-Nielsen "Memoirs of a curious scientist"