论文部分内容阅读
血压:在本课提问过程中,重要地考查学生关于心脏工作和心脏向血管排出血液的知识,这样就容易由旧教材过渡到新教材。血压的不同对血液在血管中流动的作用,不容易为学生所接受。这里重要地是给以鲜明的叙述和运用具体的实例。为了达到这个目的就必须使学生明确动物的颈动脉被切断,血液就会像喷泉一样喷出;如果损伤了四肢的大动脉,血液流失较少;从损害的静脉流出的血液却是缓慢的。这样的事实就允许我们作出结论:“心室收缩所产生的血压,由心脏传处到血管里”。现在不难说明血压的不同就是血液在血管中流动的主要原因。应该指出静脉回到心脏入口处的血压是较低的,这就促使血液流回心脏。
Blood Pressure: During the course of this lesson, students were asked to critically examine their students’ knowledge of heart work and heart blood discharge to the blood vessels, thus making it easy to transition from old textbooks to new ones. Different blood pressure on the role of blood in the blood flow, not easy for students to accept. It is important here to give a clear description and use of concrete examples. To achieve this goal, students must be made aware that the animal’s carotid artery is severed, and blood spouts like a fountain. Blood damage is less if the aorta of the extremities is damaged, and the blood flowing from the damaged vein is slow. This fact allows us to conclude: “The blood pressure produced by ventricular contraction, from the heart to the bloodstream.” Now it is not difficult to explain the difference in blood pressure is the main reason blood flows in blood vessels. It should be noted that the blood pressure that the veins return to the entrance to the heart is lower, which causes the blood to flow back to the heart.