Imagine you're stranded on a desert coastline and facing dehydration. If you don't get water, you'll perish. Do you think drinking sea water will be a good idea?
Well, I will tell you how our bodies absorb water first.
You may remember the process of OSMOSIS in which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.
A concentrated solution is one that contains a relatively large amount of solute. In case of sea water, salt is the solute and water is the solvent.
Normally, the saltiness of water in your cells is the same as the saltiness outside your cells. This is called an isotonic state. But when you drink water, a concentration difference takes place. And water from the outside moves into your cells to maintain equilibrium or balance. This is called osmoregulation.
1.) What If You Drink Too Much Sea Water?If you drink too much sea water, the salinity outside your cells will increase rapidly forcing too many water molecules to move out of your cells. So, even if you are already dehydrated, your cells will release water rather than absorbing. Therefore, I conclude that drinking sea water is actually a bad idea!
2.) What If You Drink Too Much Pure Water?If you drink too much pure water, the salinity outside your cells will decrease rapidly forcing too many water molecules to move into your cells. This may cause the cells to swell and burst which may result in quick death. It's ironic that you can literally kill yourself with just by drinking pure water.
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