The heart muscle, also known as cardiac muscle, is a specialized type of muscle found only in the heart. It is responsible for pumping blood throughout the body, supplying oxygen and nutrients to tissues while removing waste products. Cardiac muscle cells are unique because they can contract rhythmically and continuously without tiring, which is essential for maintaining a steady heartbeat. Unlike other muscle types, such as skeletal muscle or smooth muscle, cardiac muscle cells are interconnected, allowing them to work together efficiently. This interconnectedness enables the heart to function as a coordinated unit, ensuring that blood is pumped effectively with each heartbeat.