So inside the oral cavity we have mechanical digestion but we also have chemical digestion as well. Chemical digestion refers to the process by which our digestive proteolytic enzymes actually act on the macromolecule food molecules and break them down into their constituents. They cleave the bonds via the process of hydrolysis. So inside or around the oral cavity we have these specialized types of glands that we're going to focus on in a future lecture. And these glands release secrete, these specialized proteolytic enzymes that help break down our food inside the oral cavity. Now the carbohydrates are the macromolecules that are broken down inside the oral cavity and we'll discuss that in much more detail in a future lecture.