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Heart Cardiac Cycle- A Level Biology OCR A
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Heart Cardiac Cycle- A Level Biology OCR A

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Describes what AVN and SAN does and how does it initiate wave of excitation. Labelled diagram of the heart showing wave of excitation. Bullet point answer to 6 mark question on describing how the coordination of the cardiac cycle works from initiating electrical impulse from the SAN to contracting the ventricles and pushing the blood out of the heart. Quick summary on ECG.