1、Digestive System,by Li Shenghui&Meng Xin,&Jin xiao&Peng Yuliang,Overview,The structure of Digestive System The function of Digestive System The process of Digestion SystemEating habits and Digestion Digestion and Health,The structure,The digestive system consists of the digestive tract （消化道）and dige
2、stive gland（消化腺） of two parts.Digestive tract is a continuation for starting oral pharynx（咽）, esophagus（食道）, stomach, small intestine（小肠）, large intestine, and finally the anus of a long muscular tubes, including the oral cavity（口腔）, pharynx, esophagus, stomach, small intestine (duodenum, jejunum, i
3、leum) and the large intestine (mecum, colon, rectum) and other units.,Digestive gland has two kinds, one is the small digestive gland ,the other large digestive gland . Digestive gland is a small, scattered and ministries of the wall inside the digestive tract. The digestive gland has three pairs of
4、 salivary glands (parotid, submandibular gland, sublingual gland), liver and pancreas, and they are borrow catheter will be discharged into the digestive tract secretions inside.,The basic function,The basic function of the digestive system are the digestion and absorption of food for the body of ma
5、terial and energy requirements . Food nutrients in addition to vitamins, water and inorganic salts（无机盐） can be directly absorbed and used.,The protein, fat and carbohydrates（碳水化合物） such substances should not direct absorption and utilization（利用） by the body, digestive tract need to be broken down in
6、to simple structure and small molecule substances, can be absorbed and used.,The digestive process,The digestive process, including mechanical digestion（物理性消化） and chemical digestion（化学性消化）. After oral chewing food, teeth grinding（磨的）, tongue stirring, swallowing, gastrointestinal（肠与胃的） muscle activ
7、ity will be large pieces of food into the small things, so that the full digestive juice mixed with food and promote food corporations or under the chyme moved over from the mouth to the anus, the digestive process is called mechanical digestion, or physical digestion.,Chemical digestion is the secr
8、etion（分泌物） of digestive juice digestive gland of food in terms of chemical decomposition. Secreted by the digestive gland digestive juice of the species, a variety of complex nutrients in the intestinal wall can be broken down into easy absorbed compounds.,Such as carbohydrate is broken down into mo
9、nosaccharide（单糖）, protein is broken down into amino（氨基酸） acids, lipids broken down into glycerol and fatty acids. And these nutrients after decomposition（分解） by the small intestine (mainly the jejunum（空腔）) absorption into the body, into the blood and lymph（淋巴）. Mechanical digestion and chemical dige
10、stion of the two functions at the same time, achieve a common digestive process.,Eating habits and Digestion,The photograph shows the healthy eating pyramid. From it we can learn that if we want to be healthy ,we shall eat less fried ,salty food ;We eat suitable Dairy products, fish ,eggs ;We can ea
11、t more fruit type food ;Mostly we should eat cereals（五谷类）.,Fruits,Hot food,Dairy products,Digestion and Health,Pay attention to your food. Know what category each food that you eat falls into, protein, carbohydrate or neutral. Once you know what food falls in what category you can easily follow the
12、following simple steps: Make sure that you eat all kinds of citrus fruits, leafy veggies, eggs, fish and meats so that you can safely avoid any nutrient deficiencies. Notice there is no mention of carbohydrates, they are an “eat only if you have to” food.,You do not want to combine any pure fats wit
13、h high starches in one meal. In other words, that baked potato with butter and sour cream is out the window. Avoid combining acids such as citrus, vinegar and buttermilk with any high starch at one meal. High starches should also not be combined with any high proteins. Fats can be eaten with protein
14、s and acids.,Foods such as meat, fish, fowl and eggs should be eaten one serving of each per day or two servings of one per day with a fat. Eat buttermilk, cheese and other dairy: Having two glasses of organic milk or two and half ounces of cheese per day. Have two servings a day of raw, low starch fruits and raw green and yellow vegetables a day.,Can you share your opinions about digestion and health with me?,
