Which type of muscle makes up the heart?

The heart is primarily composed of cardiac muscle, which is a specialized type of muscle tissue unique to the heart itself. Cardiac muscle cells, also known as cardiomyocytes, share some characteristics with both skeletal and smooth muscles, but they are distinct in their structure and function.

Cardiac muscle is involuntary, meaning it operates automatically without conscious control, which is essential for the continuous pumping action necessary to circulate blood throughout the body. This muscle type features striations, which are alternating light and dark bands, similar to skeletal muscle, yet it is not under voluntary control as skeletal muscle is. Additionally, cardiomyocytes are interconnected by intercalated discs that allow for synchronized contraction, supporting the efficient pumping action of the heart.

This specialization ensures that the heart can maintain a rhythmic and coordinated contraction pattern, which is vital for its role in maintaining blood circulation. Thus, the correct designation of the tissue that makes up the heart is cardiac muscle, highlighting its unique properties and functions necessary for cardiovascular health.