Which of the following is NOT true for ventricular systole?
• The ventricles contract during ventricular systole.
• The atria contract during ventricular systole.
• The semilunar valves open during ventricular systole.
The atrioventricular valves close at the beginning of ventricular systole.
Blood flows through the aortic and pulmonary semilunar valves during ventricular systole.