Cardiac muscle cells, also known as cardiomyocytes, are specialized cells that make up the heart muscle. These cells are unique because they can contract rhythmically and continuously without tiring, allowing the heart to pump blood throughout the body. They are striated, meaning they have a banded appearance, and are connected by intercalated discs, which help synchronize heartbeats. Unlike skeletal muscle cells, which are under voluntary control, cardiac muscle cells operate involuntarily. This means that they work automatically, controlled by the heart's electrical system. The health of these cells is crucial for maintaining a strong and efficient heart, ensuring that it can supply oxygen and nutrients to the body.