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