Now, let's move on to another type, or actually two sets of important channels known as the sodium potassium protein channels and sodium hydrogen channels. So these two protein transporters are basically stimulated by a hormone known as aldosterone. So aldosterone can activate these channels. So this should be activated, it can activate these channels, and this allows the reabsorption of sodium into the cell and the secretion of potassium into our lumen. So essentially, if this is our cell, this is the lumen side, the interstitium side, our aldosterone can act on the distal convolute tubule. It can activate this protein here, which basically even further reabsorbs the sodium from the lumen.