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在动物教学中,脊椎动物五纲的循环系统是一个教学难点.学生的感性知识少,不善于识图、绘图,习惯于死记硬背,有些基本概念混淆不清,学习起来比较困难. 要想使学生学好这部分知识,就要根据学生的知识基础,认识规律和知识的逻辑关系,设计一套能启发学生积极思维的板图,帮助学生理解教材中最关键的内容. 一在讲鱼的循环系统时,首先要帮助学生分清血管和血液名称,以及根据心房,心室的机能,认识与其相连通的血管. (一)血管名称学生在小学自然常识课本中学过动脉、静脉的定义,但由于死记硬背,没有理解这些概念,不仅不会运用已学过的知识,还常出现一些错误.如认为动脉是“由心脏发出的血管”;“由心脏发出,流向全身的血管”;“含氧、养料多的血管”;静脉是“回心脏的血
In the teaching of animals, the five-vertebrate circulatory system is a difficult teaching point.The students have less perceptual knowledge, are not good at seeing pictures, drawing, accustomed to rote, some of the basic concepts are confused and difficult to learn. To enable students to learn this part of knowledge, it is necessary to design a set of board diagrams that can inspire students ’positive thinking based on the students’ knowledge base and the logic relationship between law and knowledge to help students understand the most crucial contents of the textbook. Circulation system, first of all to help students distinguish between blood vessels and blood names, and according to the atrium, ventricular function, to understand the blood vessels connected with them. (A) the name of the blood vessels in primary school textbooks common sense of arteries and veins, but due to Rote, without understanding these concepts, not only does not use the knowledge has been learned, but also often make some mistakes, such as the artery that is “issued by the heart of blood vessels”; “issued by the heart, the blood flow to the body”; “ Oxygen, nutrients and more blood vessels ”; vein is" back to the heart of the blood