system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If blood continuously flows throughout the body, what happens to the blood that follows down a vein where a limb was amputated?

I'm not sure if i phrased the question in a way that explains what I mean so let me ask my question using mario kart as an example. The racers follow the track all around the course until returning to the start the same way the blood circulates the veins inside the body and returns to the heart. If I were to delete a portion of the track, the racers would reach a dead end and have nowhere to go. So why is it not the same with an amputation? I understand there would be more than one direction to travel but the "track" has essentially been deleted for some of these veins and I imagine veins aren't two-way steets where it can just turn around and follow a different path. Wouldn't blood just continuously hit this dead end and build up? Does the body somehow know not to send blood down that direction anymore? Does the blood left in this vein turn bad or unsafe to return to the main circulatory system over time?

I chopped the tip of my finger off at work yesterday and all the blood has had me thinking about this so im quite curious.

Edit: thanks foe the answers/awards. I'd like to reply a bit more but uhh... it hurts to type lol.
gpt
A racetrack is oversimplified. More realistically, all the veins, arteries, capillaries, etc are like a giant neighborhood, not strictly a circle with only one way to do it. So you have a fleet of mail people delivering to all those houses, and if a section of the neighborhood gets cut off, all the packages can still be delivered to all the houses that haven't been cut off via all the other connecting streets. The main supply and return veins and arteries have hundreds of thousands of branches where blood can flow between those main lines. The vascular system is the single most redundant system in basically every creature that has one.