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Biology Unit 5
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Topic 7: Run for your life


12. Understand that cardiac muscle is myogenic and
describe the normal electrical activity of the heart,
including the roles of the sinoatrial node (SAN), the
atrioventricular node (AVN) and the bundle of His,
and how the use the electrocardiograms…

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Biology Unit 5
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Electrocardiograms (ECGs)
An ECG is used to investigate the rhythms of the heart by producing a record of the electrical activity
of the heart. The depolarisation in the heart causes tiny electrical changes on the surface of your skin.
An ECG measures these changes at…

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