What happens during left ventricular systole?
1 )
The atrioventricular node causes the immediate contraction of the ventricle, causing the atrioventricular valve to close.
2 )
The Purkyne tissue between the atrium and ventricle causes the ventricle to contract, closing the atrioventricular valve and opening the semilunar valve.
3 )
The sinoatrial node causes the atrium to stop contracting and the blood pressure in the ventricle to increase above that in the atrium.
The wave of excitation causes the ventricle to contract so that the blood pressure in the ventricle is higher than in the aorta, opening the semilunar valve.
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