Which statement describes cardiac tissue?

• A. Movement, heat
• B. Walls of heart
• C. Detects stimuli
• D. Attaches to bones

Answer: (B)

Cardiac tissue is a specialized muscle that forms the walls of the heart, the myocardium. Its main job is to contract in a coordinated way to pump blood through the heart and out to the body, which is why it’s located in the heart walls. Cardiac muscle is involuntary and contains intercalated discs that connect cells for synchronized beating, enabling the heart to function as a single unit.

This description fits the walls of the heart because it emphasizes the tissue’s location and role in pumping. The other options describe outcomes or settings of muscle activity (movement or heat), nervous-system functions (detects stimuli), or skeletal muscle properties (attaches to bones), none of which define cardiac tissue itself.