The Heart 0.0 / 5 ? BiologyTransport and ExchangeASOCR Created by: BethanAyresCreated on: 04-05-14 16:55 43521 Across 1. The phase when both atria contract at the same time. (6, 11) Down 2. ECG (17) 3. Heart's pacemaker. (10, 4) 4. Has the thickest wall. (4, 9) 5. Specially adapted muscle fibres that conduct the wave of excitation. (7, 6)
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