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What happens when you put pressure on a wound?

Asked by augustlan (46582 points ) November 13th, 2012

I know it stops the bleeding, but how does it accomplish that? Obviously, it’s not like plugging a hole in a dike. In that case, when you remove the pressure, water just starts pouring out again. What exactly is the mechanism that keeps a wound from spurting forth fresh blood once the pressure is released? What is happening to the skin/nerves/whatever else underneath the pressure?

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