Decribe the first step in the process of digestion.
Ingestion and Chewing - Take in food and break into smaller pieces. This increases the surface area for enzyme action and makes it easier to swallow. This is done with the lips, tongue, and teeth. Some chemical process (digestion) also occur in the mouth. The secretion of saliva from 3 sets of salivary glands in the mouth, which moistens and lubricates food. Saliva contains the enzyme saliva amylase, which partially breaks down complex carbohydrates (Starch, glycogen) into shorter polysaccharides (chains of sugars). Finally, the tongue forms the food into a bolus (pellet).