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. Unlike other muscles, cardiac muscle cells are interconnected, allowing them to work together efficiently. This interconnectedness helps maintain a steady heartbeat, regulated by electrical signals from the sinoatrial node, often referred to as the heart's natural pacemaker. This ensures that the heart functions effectively to support overall health.