Why does the body create urine when it’s dehydrated? Shouldn’t it use the water to hydrate instead of creating a waste product?
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Let me explain a bit how the kidney works. Blood flows into the kidney. It passes through a porous structure called the glomerulus. Some blood falls out of the artery into the glomerulus and some continues and leaves the kidney untouched. This is the first control of how much urine you create. When your body is dehydrated it reduces the amount of blood flowing to the glomerulus but there will always be some blood. After blood falls into the glomerulus a lot of stuff in it get pushed back into your arteries. There’s some stuff that doesn’t, that is, proto-urine. Your body can control how much to push back into your arteries but once it enters the kidney it uses salt to facilitate the transfer. This transfer of water with salt is semi automatic at some parts and other facilitated by energy. Anything left get eventually excreted as urine.
This process is designed to be always running. If you turn it off, it break the kidney. When you are super dehydrated you kidneys keep a small amount of liquid running to make sure everything will start to work again when you drink water
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