Explain with the help of a suitable digram conducting system of human heart.
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Explanation:
Cardiac function does not require intact innervations. Frog’s heart removed from the body, and in human beings who have transplanted heart, the heart continues to function. The perfusion of the isolated heart in the laboratory will also continue to beat at regular intervals.
In a frog’s heart when the chambers are separated, each of the chambers shows regular contractions on its own. The rate of contraction per minute varies. In the case of frog’s heart, the sinus venosus shows maximal rate of contractions when compared to any other chamber of heart.
This can also be proved by applying first and second Stannius ligature or effect of temperature on sinus venosus. It proves that sinus venosus is pacemaker of the frog’s heart.