Plasma osmolality

Okay kiddo, so you know how we have water in our bodies, right? And we also have different things in our blood like salt, sugar, and other stuff.

Plasma osmolality is a big word that basically means how much stuff is in our blood compared to how much water there is. Think of it like a recipe for making lemonade. If we put too much sugar or salt in the water, it won't taste good, right? That's kind of how our bodies work too.

Our bodies use something called osmoreceptors to check how much stuff is in our blood. If there's too much, it will tell our brains to make us thirsty so we drink more water to balance it out. If there's not enough, our brains will tell our kidneys to make more urine to get rid of some of that extra stuff.

So, plasma osmolality is just a way to measure how much stuff is in our blood compared to how much water there is. And our bodies have a special system to make sure it stays balanced to keep us healthy.