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Coronary arteries supply oxygenated blood to the cardiac muscle to ensure proper heart function.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Circulatory System - Comparative and Evolutionary Aspects
The P-wave represents atrial depolarization, not ventricular contraction.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation ECG and Blood Vessels
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