Well, there are three important functions that we should consider. Function number one, as we'll see in just a moment, it basically reabsorbs important nutrients and electrolytes that are secreted into our filtrate when our blood plasma travels across the glumerolus and into our Bowman's capsule, and we'll see what those nutrients and electrolytes are. So our Proximal convolute reabsorbs those nutrients from our filtrate back into our blood system via these capillaries that run along our Proximal convolute, the peritubular capillaries. Now, the second function of the Proximal Convoluted tubule is that in secretion, it secretes certain types of molecules and ions that are no longer needed by our body. And this includes things like hydrogen ions as well as bicarbonate ions, as we'll see in just a moment. Now, the final function of our Proximal Convoluted tubule is to actually prevent the movement of waste products from the filtrat found inside the lumen of the Proximal convolute and into our blood system.