Which type of muscle is found in the heart and responsible for pumping blood?

• A. Skeletal muscle
• B. Cardiac muscle
• C. Striated muscle
• D. Smooth muscle

Answer: (B)

Cardiac muscle is the specialized type of muscle that is found exclusively in the heart. Its primary function is to pump blood throughout the body, which is essential for maintaining circulation and providing oxygen and nutrients to tissues.

This muscle type has unique characteristics that distinguish it from skeletal and smooth muscles. Unlike skeletal muscle, which is under voluntary control and responsible for movement of the skeleton, cardiac muscle operates involuntarily; it contracts rhythmically and autonomously to facilitate the continuous pumping of blood. This autonomic function is crucial for sustaining life.

Cardiac muscle cells are interconnected through specialized junctions called intercalated discs, which allow for rapid transmission of electrical signals and synchronized contractions throughout the heart. The striated appearance of cardiac muscle, which might suggest a similarity to skeletal muscle, shows that although both have a striped texture, their functions and mechanisms of control differ significantly.

In summary, cardiac muscle is specifically adapted for the heart's unique role in the circulatory system, making it the correct answer.