Why do rubber bullets leave an outline rather than a filled in circle as a bruise?
In: Biology
Lol it’s not only rubber bullets.
This is easy to see.. get some dough, roll it flat, slap it hard. As your hand pushes down, the stuff under your hand will rush to get out and form a ridge around the dent.
In this cake the bullet pancakes (which is exactly why it doesn’t kill you, usually) and essentially “slaps” you really hard, pushing all the blood out of the impact area, leaving it pale, and into the area right around it, the swelling and contusion. Once the blood returns to the crushed capillaries, you should have a nice uniform bruise..
However, you don’t have to go this far to see the same effect. Paintballs do the same thing, if you dont freeze them first (yeah i have fucked up friends).. as will, believe it or not, a nice and solid slap.
Have someone slap you as hard as they can on your back or your arm, you will see the same welting around the impact site. It’s simply blood moving around as the capillaries are squished and burst.
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