What is the term for the sequence SAN - Atrial Systole - AVN - Bundle of His - Purkinje Fibres - Ventricular Systole?

• A. SAN - Atrial Systole - AVN - Bundle of His - Purkinje Fibres - Ventricular Systole
• B. Cardiac Control Centre
• C. CCS Order
• D. Systole

Answer: (C)

The sequence describes how the heart’s electrical impulse travels through the conduction system to coordinate the timing of atrial and ventricular contractions. The sinoatrial node starts the impulse, causing atrial systole. It then travels to the atrioventricular node, where a short delay allows the atria to finish contracting and the ventricles to fill. From there the impulse moves down the Bundle of His, through the bundle branches, to the Purkinje fibers, triggering ventricular systole. The best term for describing this ordered path is Cardiac Conduction System Order (CCS Order), which specifically names the sequence of the conduction system events rather than just the contraction phases or brain control.