And so we see that by adding cholesterol into our cell membrane we basically control the fluidity of our cell membrane. By adding cholesterol, we decrease the fluidity because we basically allow we pack these hydrophobic and hydrophilic sections closer together. So we can imagine that by placing this wall we call the cholesterol into our cell membrane. We basically decrease the space between these regions and they aren't able to move as much because of that wall, our cholesterol that is placed inside that cell membrane. So cholesterol electrode decreases the fluidity of the membrane because it forces the phospholipids closer together. And of course, we're assuming a constant temperature.