All of the following are correct except, ---------------------. Sinoatrial node is the dominant pacemaker of mammalian heart AV node is the latent pacemaker of mammalian heart Amplitude, duration and...

All of the following are correct except, ---------------------.

1. Sinoatrial node is the dominant pacemaker of mammalian heart


2. AV node is the latent pacemaker of mammalian heart


3. Amplitude, duration and configuration of cardiac action potentials differ at various sites across the heart


4. All of the above are correct


5. Only A and B are correct