00:01
In this question, we're told that cell a has a membrane that's permeable to water as well as urea, but not to nacl, and it's placed into solution b, and we're asked which way will the net movement of water be at equilibrium, and is the solution going to be hypertonic, hypotonic, or isotonic.
00:16
So let's discuss what these three terms are.
00:18
So hypertonic, i think the easiest way will be to draw a cell and say everything inside the cell is inside the cell, of course, and everything outside the cell is outside the cell.
00:31
Hypertonic means that we have more solutes, which i'll use a different color for them.
00:35
So let's imagine these blue circles are like, you know, they could be sodium ions, they could be glucose, they could be whatever you want.
00:41
But hypertonic just means that there's more of it outside the cell than inside.
00:45
Isotonic means that there's the same number.
00:53
So in this case, you know, i'll draw like five of them and then five inside the cell.
00:58
And then finally for hypotonic, it means that there is more stuff inside the cell...