Problem: Draw a visual representation of the digestive activities within the oral cavity. This can be creative and does not need to be artistic. You can use shapes and arrows to represent structures and activities. Include the following (with labels): oral cavity with teeth, tongue, saliva and food bolus, salivary glands and ducts, parasympathetic motor neurons innervating salivary glands. Label the following digestive activities where they occur on your diagram: mechanical breakdown, propulsion and digestion (carbohydrate).