And that allows the movement of our fluid along of our food, along that stomach lining. And what it also does, and perhaps the more important function of the mucus, is to basically provide protection to the epithelial cells, the epithelial lining of our stomach. So, as we'll see in just a moment, the stomach has a very high acidity, a very low PH, and that can easily destroy the lining of that stomach. And to prevent our epithelial lining from destroying itself as a result of that high acidity, these mucol cells secrete this mucus that protects our epithelial lining from degradation. Now, as we see from this diagram, the mucous cells are found on the lining of that stomach and also on the upper portion of our exocrine gland ducts. So let's move on to our achieve cell.