system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do we bleed without tearing a vein?

If blood runs in our veins, how come we bleed when we get a (not deep at all) cut? We don't cut our veins (I think) because we would die from that? How can we bleed?
gpt
Your circulatory system isn't made up of a few very large veins and arteries but rather billions of vessels ranging in size from the big veins and arteries you know down to extremely tiny ones that go close to the surface of your skin.  Everything in your body needs blood for nutrients and oxygen, so we have a circulatory system to feed them.

That's why you bleed when cut, you're cutting the little tiny ones not the big ones.