In an electrocardiogram, the P wave represents
Correct answer: C. depolarisation and contraction of the atria
- A. repolarisation of the ventricles
- B. contraction of the ventricles
- C. depolarisation and contraction of the atria
- D. closure of the heart valves
Explanation
The P wave records the spread of excitation across the atria, which then contract. The QRS complex shows ventricular depolarisation and the T wave ventricular recovery, so each deflection maps to a specific electrical event.
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About Human Heart
The human heart is a four chambered muscular pump that maintains double circulation through the pulmonary and systemic circuits. Questions cover atria, ventricles, valves, major blood vessels, the cardiac cycle, pressure changes, the conduction system and ECG, while distinguishing arteries and veins from the chambers that receive or eject blood.
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