在解剖青蛙时,使学生观察它的心脏跳动是非常重要的一项内容,这不仅能使学生更清楚的认识心室和心房的位置、数目及其规律的收缩活动的机能,而且也激发了学生观察的兴趣和唤起了学生观察的积极性。但是观察的时间如果遇到青蛙即将进入冬眠或已经进入冬眠的时候,天气渐渐寒冷,解剖后常常发现青蛙的心脏不跳动或跳动微弱,或刺激一下跳一下的现象。这样就大大的降低了教师的期望和同学们的观察兴趣。对这个问题怎么办呢?以前我们总是“碰点”或给学生解释为天气冷了,由于青蛙进入冬眠代谢缓慢的缘故。后来在解剖 In the dissection of the frog, to enable students to observe its heart beating is a very important part of not only enable students to better understand the ventricular and atrial position, number and regular contraction function, but also inspired students Observe the interest and arouse the enthusiasm of students to observe. However, if the frog is about to enter hibernation or has entered hibernation, the weather gradually becomes colder. After the dissection, the frog’s heart is often found not to be beating or weakening, or to stimulate the phenomenon of jumping. This greatly reduces the teachers ’expectations and students’ interest in observation. What to do with this problem? In the past we always “touched” or explained to the students that the weather was cold, due to slow metabolism of the frog into the hibernation. Later in the anatomy