Jacqueline Pinon BIO202 11/5/2016 Process of the Digestive System Outline Mouth (Oral Cavity) - Ingestion- Mechanical digestion: chewing. Chemical digestion: saliva contains amylase and lipase. o In the mouth, carbohydrates are broken down by amylase into maltose (a disaccharide ) and then move down the esophagus, which produces mucus for lubrication, but no digestive enzymes . Teeth and their Function- The central incisors and lateral incisors are primarily used for biting and cutting or tearing and canine teeth are primarily used for tearing food. The premolars, molars, and wisdom teeth are primarily used for chewing and grinding food. o Helps in mastication. o Aids in articulation and speech. o Gives shape and beauty to the face. o Helps in giving facial expressions. o Like in animals, it may be used for self- protection and attack. o Adult- 32 teeth 4 third molars (also called wisdom teeth ) 4 second molars (also called 12-year molars) 4 first molars (also called 6-year molars) 4 second bicuspids (also called second premolars) 4 first bicuspids (also called first premolars) 4 cuspids (also called canine or eye teeth) 4 lateral incisors 4 central incisors o Deciduous (Baby or primary teeth)- 20 teeth 4 second molars 4 first molars 4 cuspids (also called canine or eye teeth) 4 lateral incisors 4 central incisors The Oral Cavity has limited digestion of carbohydrates and lipids (amylase and lipase).
The Tongue is involved in secretion of mucins and the enzyme lingual lipase (breaks down some fats). o The parotid salivary glands produce a serous secretion containing large amounts of salivary amylase (carbohydrates). o The submandibular salivary glands secrete a mixture of buffers, glycoproteins called mucins, and salivary amylase. Saliva as lubrication and source of enzymes o Saliva dissolves food. o Saliva contains mucin, a protein that lubricates the bolus (chewed up food ball). o Saliva contains amylase, which breaks down polysaccharides (starch and glycogen).
- Spring '14
- Large intestine, Made A 35/30 On This Project!