During heart transplantation, human heart continues to beat even after it is removed from the donor’s body and all of its nerves have been cut. Which of the following statements is the most appropriate explanation for this feature?

Less than 2% of cardiac muscle act as nerve cells by producing impulses. They are known as nodal tissues. This nodal tissue controls the contraction of the heart. As the heartbeat is initiated and the impulse is generated in the heart itself by cardiac muscle, it is called as myogenic heart.