The Heart 0.0 / 5 ? BiologyTransport and ExchangeASOCR Created by: BethanAyresCreated on: 04-05-14 16:55 Has the thickest wall. Left ventricle 1 of 6 The phase when both atria contract at the same time. Atrial contraction 2 of 6 Specially adapted muscle fibres that conduct the wave of excitation. Purkyne tissue. 3 of 6 When all 4 valves are closed. Ventricular contraction 4 of 6 Heart's pacemaker. Sinoatrial node 5 of 6 ECG Electrocardiogram 6 of 6
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