Now recall, as we mentioned earlier, within our tubular section of the nephron, we have reabsorption and secretion taking place between our peritubular capillaries. So certain substances that are actually filtered across and into the Bowman's capsule are reabsorbed back by that body. And this includes things like amino acids and glucose, sodium chloride, as well as many other things. Now we can also have secretion taking place. Certain substances that end up traveling into the Eve farin arterial and then into the peritubular capillaries can actually be secreted back into our filtrate and eventually ends up in our urine that is released by our body. So we see that there are actually only two ways by which a given substance can actually end up being in the filter.