Blood moves through arteries and veins, like water through the pipes in your wall. A pressure “ulcer” is more like an area of dead soft tissue. Imagine if your wall made of drywall was damaged and you had to pull apart the damaged drywall. The pipes are still there holding in the water inside the wall. If you were careful taking it apart you would not expect water to start spraying out.
Another way of asking this questions is why you don’t bleed to death when you a surgeon cuts into your body. Of course there is a little bit of bleeding which is cauterized. But even without cauterizing there is surprisingly little bleeding during many surgeries. The reason is that the surgeon is not cutting the large blood vessels and so the blood stay in where it belongs.
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