Atrial depolarization is represented by:
Correct answer: A. P wave
- A. P wave
- B. QRS Complex
- C. T wave
- D. PQRS
Explanation
The P wave on an electrocardiogram (ECG) represents atrial depolarization, which is the electrical activation that initiates the contraction of the atria. The QRS complex follows, representing ventricular depolarization, while the T wave represents ventricular repolarization. Therefore, the P wave is specifically associated with atrial depolarization. The term 'PQRS' is not a valid ECG component, thus it does not correspond to any specific physiological event in the heart.
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About Cardiac Cycle and Heartbeat
The cardiac cycle describes atrial systole, ventricular systole and diastole, including pressure changes, blood movement and the opening or closing of heart valves. It also covers the conduction pathway from the sinoatrial node through the atrioventricular node, bundle of His and Purkinje fibres, and relates these events to heartbeat sounds.
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