Which cardiac cell property describes the ability to conduct impulses?

• A. Automaticity
• B. Excitability
• C. Conductivity
• D. Contractility

Answer: (C)

Conductivity is the property that allows electrical impulses to be transmitted from cell to cell through the heart's conduction system, enabling a coordinated heartbeat. Impulses spread via gap junctions in intercalated discs, so depolarization travels quickly and the atria and ventricles contract in a synchronized wave. This differs from automaticity (the ability to start impulses on its own, like pacemaker cells), excitability (the ability to respond to a stimulus and generate an impulse), and contractility (the ability of muscle fibers to contract). Since the question focuses on the transmission of impulses through the heart, conductivity is the best fit.