system
Given the following post, respond as if you're commenting on Reddit:
human
Why are some veins squiggly?

For example in the eye you can sometimes see very squiggly veins, but also in other places on the body. 

Would it not make more sense if all our veins were straight, meaning they’re shorter and less work would be needed to pump the blood across the body? Or is there a reason for the squiggles?
gpt
If all of our veins were just straight lines every time you out stretch your arm or turn your head or walk you'd be potentially stretching and ripping your interior vascular system - you need some slack in the body.