Now, this side of the membrane that faces the lumen portion is known as the apical side, and this other side across it is known as the basil lateral side. So we have ions that enter via our apical side, eventually travel down through the basil lateral side, and will enter the peritubular capillaries. So now let's actually discuss how the absorption and secretion takes place across our cell membrane of the epithelial cells found within the proximal convoluted tubule. And let's discuss which molecules and ions are reabsorbed and which ones are secreted. Now, the proximal convoluted tubule of that nephron basically is responsible for absorbing about 70% of all the sodium and water that is found within our filtrate. And it also basically absorbs 100% of our amino acids and glucose molecules that end up in our filtrate when the blood plasma travels from our glomerulus to our Bowman's capsule.