Which statement concerning events that occur in the heart is correct?
As the wave of excitation passes through the atrioventricular node there is a time delay before it passes down the Purkyne tissue to the ventricles.
2 )
Movement of blood into the ventricles following atrial contraction causes the ventricular blood pressure to rise above the blood pressure in the atria, closing the atrioventricular valve.
3 )
The band of non-conducting tissue between the atria and ventricles causes the wave of excitation to pass through the Purkyne tissue to reach the atrioventricular node.
4 )
The sinoatrial node in the left atrium, sends out a wave of excitation that spreads across the walls of the atria, resulting in the movement of blood from the atria into the ventricles.
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