So now let's focus on each one of these four cells and discuss the functionality of these cells. And later we're also going to mention a fifth cell found in our stomach lining, also known as the anterochromaphin like cell. So, let's begin with our mucus cell. So, mucus cells are easy to remember because what their function is to secrete a special type of substance known as mucus. Now, mucus is a fluidlike substance that consists of glycoprotein, water, electrolytes, so our ions as well as other molecules. And what the mucous does is it ultimately lubricates our stomach lining.