The question is how? Because inside our body, we have many different types of acidbased reactions take place. So within cells and outside of cells and in our blood, we continually have fluctuations in hydrogen ion concentrations. So it's very, very important for our body to be able to control and regulate and prevent these drastic changes in PH from happening. Well, as we'll see in just a moment, our body uses buffer system solutions that contain buffer systems. And we'll see what that means in just a moment.