Which statement about events that take place in the heart is correct?
- AAs the wave of excitation passes through the atrioventricular node there is a time delay before it passes down the Purkyne tissue to the ventricles.
- BMovement 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.
- CThe 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.
- DThe 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.