How is saliva so readily produced? Do we just have reservoirs of water in storage somewhere in our head?
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Youre not conceptualizing “water” in something. Say you take some jello mix. Its originally just some dry dust looking stuff. Add some water (and mix/fridge it) and now you have gelatin. But if you cut into jello, does water spill out as if its a baloon? Of course not. There is a lot of water, but it is being held in place within the structure of the gelatin.
Something similar happens in your body. You have a lot of water all throughout your body. Sure, a lot in your blood, but you also have water just all throughout — water allows cells in your body to move electrolytes and other things around.
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