So this entire segment, the Proximal convolute Tubule, is located entirely in the renal cortex of the kidney, in the outer portion of the kidney, below the renal medulla. So this is the cortex and this is the medulla that is not shown. Now, what exactly is the function of the Proximal Convoluted tubule? 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.