This also moves this way into our lumen. So these two ions are secreted. These two ions are absorbed, while glucose and amino acids are the two nutrient molecules that are also absorbed. Now, notice that as all these ions, as these ions and this ion basically moves into the cytoplasm of our epithelial cell, that increases the concentration of solute inside our cell and that also increases our osmotic pressure. And that will basically allow the passive transport of our water across the membrane from the lumen side to our cytoplasm. Why does the water move this way?