system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does our stomach seperate stomach acid from other fluids we drink and controls what gets into our bladder?

I've wondered about that today. I found no answer to how that's possible, can someone please explain how our stomach achieves that?
gpt
It doesn't, really. Everything from the stomach enters the intestines, and there the stomach acid is neutralised by the addition of bicarbonate produced by the pancreas. That reaction produces carbon dioxide, salt, and water, all of which your intestine is fine to absorb.