Why do we bleed from everywhere even if a vein isn’t cut?
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Think of a road map. You have these huge multi-lane roads called motorways (or highways or whatever your locale calls them) that span a long distance. Off that road are a bunch of slightly smaller ones. They’re usually big too but not so wide or long and support a bit less traffic, maybe head into large cities. Off that road, even more roads splinter off. These go to various towns and villages. Off those roads, we get to these even smaller ones that only have maybe a few houses in the street. And those roads serving a house will all have a tiny driveway.
Those relatively few major roads we started with form connections with essentially every building in the country.
Now think of those major roads as the major blood vessels. Think of the houses as the cells. The smallest roads are “capillaries”, tiny blood vessels that extend out from the other blood vessels.
Thus all the cells of your body get a supply of oxygenated blood. That means when you cut yourself there’s some blood in that region.
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