大学英语digestive-system.pptVIP

Digestive system The function of the digestive system is to prepare food for intake by body cells. Nutrients must be broken down by mechanical and chemical means into molecules that are small enough to be absorbed into the circulation. Within cells, the nutrients are used for energy and for rebuilding vital cell components. Digestion takes place in the digestive tract. Digestive tract The human digestive system includes mouth, pharynx, esophagus, stomach, small intestine (duodenum, jejunum and ileum), large intestine（cecum，appendix，colon and rectum） and anus. Mouth, oral cavity Or/o: oral cavity, oral administration oral language stomat/o: stomatitis, stomatoscopy saliva: is the watery substance produced in the mouths. It is produced in and secreted from the salivary glands. Human saliva is composed mostly of water (99.5%), but also includes electrolytes, mucus, antibacterial compounds, and various enzymes . The enzymes in the saliva break down some of the starch and fat in the food at the molecular level salivary amylase Tooth Dent/i: Dentist: a medical professional who specializes in the care of teeth Dentalgia: toothache odont/o: Oligodontia: the condition of naturally having fewer than the regular number of teeth, it is also called hypodontia Periodontitis: refers to a number of inflammatory diseases affecting the tissues that surround and support the teeth tongue Lingu/o Linguistic Sublingual tablet: Usually a small, flat tablet intended to be inserted beneath the tongue, where the active ingredient is absorbed directly through the oral mucosa and into blood; such a tablet dissolves very promptly. Nitroglyerin sublingual tablet: a type of vasodilator. It relaxes blood vessels, increasing the blood and oxygen supply to your heart. This medicine is used to relieve chest pain caused by angina. esophagus esophagus is a muscular tube whose contractions can propel food to the stomach. eso- = inside,