Question

Describe what is happening in the heart at each stage of an ECG.

Accepted Answer

ECG stages:P-wave - wave of excitation spreads over both atria from SA node causing the atrial muscles to contractPR segment - delay at AV node to allow filling of ventriclesQRS complex - wave of excitation spreading up walls of ventricles from the apex, causing ventricles to contractT wave - ventricles repolarise after which - ventricular diastole

Front	Describe what is happening in the heart at each stage of an ECG.
Back	ECG stages: P-wave - wave of excitation spreads over both atria from SA node causing the atrial muscles to contract PR segment - delay at AV node to allow filling of ventricles QRS complex - wave of excitation spreading up walls of ventricles from the apex, causing ventricles to contract T wave - ventricles repolarise after which - ventricular diastole

Ventricles Wave Excitation Node Causing Contract Describe Happening