eli5: Why is it that when people stand up too quickly they only see black dots for a few seconds?

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Where does that come from?

In: 5

4 Answers

Anonymous 0 Comments

The pressure needed for blood to reach your brain is higher when standing than it is when laying down. Your body is constantly regulating blood pressure, but if you stand up quickly it doesn’t have enough time to respond si your brain is depraved of oxygen for a few seconds leading it to start slowing down. One result of this is the tunnel vision you refer to.

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