Does the heart still beat on ECMO?

Could you please elaborate on the concept of ECMO and its impact on the functionality of the heart? Is it possible for the heart to continue beating normally while a patient is on ECMO support? If not, what are the mechanisms at play that allow the ECMO machine to temporarily take over the heart's duties and maintain blood Flow throughout the body? Additionally, what are the potential risks and benefits associated with ECMO therapy, and how does it factor into the overall treatment plan for patients with severe cardiac or respiratory issues?