So what do we mean by hypertonic environment? So on the outside of the cell, we have a high concentration of solutes. On the inside, we have a low concentration. So what that means is water is going to flow from the inside to the outside. And so on the inside the cell, we're going to have a low osmotic pressure. Now, when the scientists took those cells and placed them into a medium that we would typically find inside our body, what they found was water basically rushed into the cell that enlarged the cell, and the cell eventually lysed.