Question
Choose the correct sequence of events during a Cardiac cycle:
A. SA (Sino-Atrial) node
B. Atrial depolarization
C. Conduction through AV (Atrio-Ventricular) node
D. Ventricular repolarization
E. Ventricular depolarization
Choose the correct answer from the options given below:
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
A, B, C, E, D
Cardiac Cycle Electrical Events Sequence
The cardiac cycle involves a precise sequence of electrical events that coordinate heart contractions. Understanding this sequence is key to understanding heart function.
Sequence of Cardiac Electrical Events
The correct order of electrical events during the cardiac cycle begins with the natural pacemaker and progresses through the heart's conduction system:
- A. SA node: The heart's primary pacemaker, the Sino-Atrial (SA) node, initiates the electrical impulse.
- B. Atrial depolarization: The impulse spreads from the SA node across the atria, causing atrial depolarization, leading to atrial contraction.
- C. Conduction through AV node: The impulse reaches the Atrio-Ventricular (AV) node, where it is briefly delayed. This delay allows the atria to fully empty their blood into the ventricles.
- E. Ventricular depolarization: Following the AV node delay, the impulse travels rapidly down the Bundle of His and Purkinje fibers, causing ventricular depolarization and initiating ventricular contraction.
- D. Ventricular repolarization: After contraction, the ventricles undergo repolarization, preparing them for the next cycle.
Therefore, the correct sequence is A, B, C, E, D.
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