(2 equals 7? Figure 5 shows the digestive system model. Please answer according to the picture: (1) The food I eat every day is mainly digested and absorbed in _ _ _ _ _ _ _ _.

(8), J, The main organ for human body to digest food and absorb nutrition is the small intestine, which is characterized by: the length of the small intestine is about ~6 m, and there are various digestive juices such as intestinal juice, pancreatic juice and bile in the small intestine; There are annular folds on the inner wall of the small intestine, and there are small intestinal villi on the folds, which increases the area of digestion and absorption; There are capillaries and lymphatic capillaries in the villi of small intestine, and the villi wall, capillary wall and lymphatic capillary wall are all composed of a layer of epithelial cells, which is beneficial to the absorption of nutrients. Among the absorbed nutrients, water is an important substance in human life activities, and human nutrients and wastes must be dissolved in water before they can be transported.

(Less), the place where starch is digested is the mouth and 8 small intestines, and 6 stomach has no digestive effect on starch, so some oral drugs are packaged in capsules made of starch to avoid the stimulation of drugs to the stomach.

(3) Insulin is secreted by the endocrine part of islet, which can regulate sugar metabolism, promote glycogen synthesis, accelerate blood sugar decomposition and reduce blood sugar concentration. Insufficient insulin secretion can lead to diabetes, and insulin injection is generally used to treat diabetes. At present, a large amount of insulin used to treat diabetes in clinic is produced by scientists through transgenic technology of Escherichia coli.

So the answer is: (8)[8] small intestine; water

(less) [6] stomach

(3) pancreas; gene transfer