Which type of muscle forms the wall of the heart?

Cardiac muscle is the specialized type of muscle that forms the wall of the heart. This muscle tissue has unique properties that allow it to contract rhythmically and involuntarily, facilitating the continuous pumping of blood throughout the body. Cardiac muscle fibers are interconnected by intercalated discs, which enable coordinated contractions, ensuring that the heart beats effectively as a unit. This property is essential for maintaining proper circulation.

In contrast, skeletal muscle is primarily under voluntary control and is found attached to bones, playing a role in movement. Visceral muscle, often referred to as smooth muscle, is found in the walls of hollow organs (such as the intestines and blood vessels) and also operates involuntarily. Striated muscle is a broader term that includes both skeletal and cardiac muscle, characterized by a banded appearance under a microscope.

Thus, the specificity of cardiac muscle in relation to the heart's structure and function underscores why it is recognized as the correct answer.