Which statement correctly describes cardiac muscle?

• A. Involuntary muscle tissue found only in the heart.
• B. Found in walls of blood vessels.
• C. Voluntary muscle attached to bones.
• D. Non-striated muscle in digestive tract.

Answer: (A)

Cardiac muscle is the heart’s own muscle tissue, responsible for producing the rhythmic contractions that pump blood. It is involuntary, meaning it contracts automatically without conscious effort, and it is located only in the walls of the heart. While it shares a striated appearance with skeletal muscle, its activity is not under voluntary control, which is why it’s distinct from muscles attached to bones. It’s also different from smooth muscle, which is non-striated and found in the walls of blood vessels and the digestive tract. So the statement accurately describes cardiac muscle as involuntary tissue found only in the heart.