初中生理卫生第五章消化系统教学重点是胃、肠的构造和功能,而课本只布置唾液淀粉酶一个简单实验。所以,我在教学中增设了胃、肠的演示实验,现将这些实验介绍如下一、胃一节的演示实验 1.准备工作:在讲授这一节课前一星期,从市场买回猪胃。最好不用水洗,切开胃,刮下粘液,或者切几小块胃壁肌肉片,然后放入 Junior Middle School Physical Hygiene The fifth chapter of the digestive system focuses on the structure and function of the stomach and intestines, and the textbook only arranges saliva amylase for a simple experiment. Therefore, I have added demonstration experiments for the stomach and intestines in my teaching. Now I will introduce these experiments as follows: 1. Demonstration experiment in the stomach section 1. Preparation: In the week before the lecture, I bought back the stomach from the market. . It is best not to wash with water, cut the appetizing, scrape the mucus, or cut a few pieces of stomach wall muscle, then put