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How your body replaces blood after you donate

HERE’S THE INTERESTING PART

You lose some fluid, but you gain a completely renewed internal army. When your kidneys detect a drop in blood oxygen after a donation, they secrete a protein that sends your bone marrow into overdrive. Within a few weeks, your body replaces the lost volume with brand new, highly efficient cellular oxygen carriers. And you get a free cookie.

How your body replaces blood after you donate
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