system
Given the following post, respond as if you're commenting on Reddit:
human
How does the blood circulatory system adapt to amputations?

For example if your leg is amputated, all blood vessels going to the leg are now dead ends and the blood can't circulate normally. 
How does the blood coming from the heart get back to the heart if the connection via blood vessels is severed?
gpt
Rather than being one long continuous loop, your arteries actually give off smaller arterioles along their entire length. These arterioles perfuse the capillary beds that are in all your tissues. This means that even if you clamp off an artery halfway up your arm, there are still pathways for the blood to get to capillaries and then back into the venous circulation. You can think of your circulation as being a bunch of parallel circuits, so even if one gets blocked, there are still other pathways. Blood vessels can also change size over time to adapt for major changes like amputation.