Origin of the Frog Heart Beat (With Diagram) | Animals | Zoology
In this article we will discuss about the origin of the frog heart beat with the help of suitable diagram. By separating atria from the ventricles of excised hearts, William Harvey in 1628 had shown that the atrial rhythm was higher than the ventricular rhythm. Keith and Flack (1907) have described that from the S.A. node the heart beat first [...]