Age changes in the pulsation frequency of the embryonic chick heart
Age changes in the pulsation frequency of the embryonic chick heart
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DOI：
10.1002/jez.1400850202
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发表时间：
1940-11-01
影响因子：
--
通讯作者：
Barry, A
中科院分区：
文献类型：
--
作者：
Barry, A
通过蛋壳上的玻璃窗观察到的心跳频率随着年龄的增长而增加。这种增长的加速率起初是很快的。到孵育第5天，它缓慢增加，并围绕平均值周期性波动。单个胚胎心跳速率的变化远小于将来自许多个体的数据分组的图表。在某些个别情况下，从第34小时到第40小时的变化很小，当心房起着起搏器的作用时，就像当窦启动整个心脏的跳动时一样。这些变化可能部分是由于心肌内部环境的变化，但没有证据表明它们是由任何外部波动冲击胚胎引起的。
The frequency of the heart beat observed by means of a glass window in the egg shell was found to increase with age. The rate of acceleration of this increase is at first rapid. By the 5th day of incubation it increases slowly, and fluctuates cyclically about a mean value. The variation in the rate of heart beat of individual embryos is much less than appears from graphs in which the data from many individuals are grouped. The variation in some individual cases is as small from the 34th to the 40th hrs., when the atrium is acting as pacemaker, as it is when the sinus is initiating the beat of the entire heart. These changes may in part be due to changes in the internal environment of the myocardium, but there is no evidence that they were caused by any external fluctuations impinging on the embryo.