Only one of these statements about the extraordinary excitation occurring in the ventricular myocardium correct. Name the correct statement:

Answer options

1. It decreases the rate of excitation conduction the working cardiomyocytes
2. It has no effect on the automaticity of the sinoatrial node
3. It decreases the automaticity of the sinoatrial node
4. It increases the rate of excitation conduction the working cardiomyocytes
5. It increases the automaticity of the sinoatrial node