During left ventricular systole, what occurs?
- AThe atrioventricular node causes the immediate contraction of the ventricle, causing the atrioventricular valve to close.
- BThe Purkyne tissue between the atrium and ventricle causes the ventricle to contract, closing the atrioventricular valve and opening the semilunar valve.
- CThe sinoatrial node causes the atrium to stop contracting and the blood pressure in the ventricle to increase above that in the atrium.
- DThe 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.