Your basically a sponge. Take a dry sponge it’s really light. Now soak it in water. The water will fill all the holes. Now the sponge is say 70% water.
Your cells are like that sponge. They consist of a thin outer layer. Which encloses a bunch of liquid. Think tide pod. Your cells are mostly empty space filled with water. If you’ve ever accidentally torn off skin before there’s blood you might notice it’s wet. You just ripped some cells open and their wet insides spilled out
These numbers aren’t precisely correct, but pretty close:
Your body is 2/3 water.
2/3 of total body water is inside cells.
Of the stuff that’s outside cells, 2/3 is “loose” inside your tissues (“interstitial fluid”) and 1/3 is in the bloodstream.
(Peanut gallery: what about blood cells? There’s water inside cells AND in the bloodstream. Yeah, yeah, I said these were approximations.)
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