You’re always told to apply pressure, but how does that actually staunch the flow of blood to the area?
In: Biology
You’re placing your hands over the wound. The wound is still open, but you’re holding it (mostly) shut. Because you’re holding it shut, the blood has trouble escaping.
The pressure and closing of the wound is preventing the bulk of the blood from escaping. This gives you time to place a bandage over the wound/get medical assistance.
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