What type of muscle is the heart categorized as?

The heart is categorized as cardiac muscle, which is unique to the heart itself. This type of muscle is specialized for continuous, rhythmic contractions that are essential for pumping blood throughout the body. Cardiac muscle cells are interconnected by intercalated discs, which allow for the rapid transmission of electrical impulses, enabling coordinated contractions. This is critical for maintaining an efficient heartbeat and ensuring that oxygenated blood is delivered to tissues.

Skeletal muscle, which is under voluntary control, is found in the limbs and other parts of the body, and its contractions are not automatic like those of cardiac muscle. Smooth muscle, on the other hand, is found in the walls of hollow organs such as the intestines and blood vessels, and it operates involuntarily as well. Striated muscle refers to both skeletal and cardiac muscle, as both have a striated appearance under the microscope due to their organized structure. However, the specific and defining type of muscle that the heart consists of is cardiac muscle.