eli5 how does our blood get back up when once it’s in our feet ?
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There’s a series of one-way valves in the return lines of the circulatory system to make sure that blood can only flow *out* of the legs and won’t just backflow and pool there.
When you walk, the muscles in your legs constrict around those veins and arteries and help push the blood along.
This is why moving around is so good for you, it’s an integral part of your circulatory system that takes load off the heart.
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