Respuesta :

It would be the sinoatrial node and atrioventricular node.

Hope This Helps You!
Good Luck Studying :)
The sinoatrial node is the normal natural pacemaker of the heart and is responsible for the ... It is an elongated structure extending between 1 and 2 cm on the right from the crista terminalis the crest of the right atrial appendage, and runs
ACCESS MORE
EDU ACCESS