How come when you get blood drawn the vein doesn't just keep bleeding?

Waffles731
I got blood drawn today, and I've always wondered why after the needle is gone it doesn't continue to bleed, I mean there is a hole in the vein.
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+1 y
Like I get the whole clotting and scab thing but why does it happen so quickly in this case
How come when you get blood drawn the vein doesn't just keep bleeding?
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