A2 salters nuffield biology

ECG trace

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ECG traces

P wave- depolarisation of the ATRIA leading to ATRIAL SYSTOLE.

PR interval- the time taken for impulses to be conducted from the SAN across the atria to the ventricles, through the AVN.

QRS complex- the wave of depolarisation resulting in contraction of the VENTRICLES.

T wave- repolarisation (recovery) of the VENTRICLES during the heart's relaxation phase (DIASTOLE).

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