Answer
Mitochondria, the organelles responsible for cellular energy production, play a pivotal role in the beating of cardiomyocytes. Often referred to as the "powerhouses of the cell", mitochondria generate adenosine triphosphate (ATP), the primary energy currency used by cardiomyocytes for their contractile function. Without a steady supply of ATP, these specialized heart muscle cells would be unable to undergo the rhythmic contractions necessary for maintaining a regular heartbeat.