Which event occurs during ventricular systole?

Which event occurs during ventricular systole? closing of the bicuspid and tricuspid valves

In ventricular systole, the ventricle is doing contraction causing an increase of pressure inside ventricle. The pressure will close the bicuspid/tricuspid valve and open the pulmonary/aorta valve

People who utilizes the progression principle will ensure their exercise program increases in frequency, intensity, time, and type. the changes need to happen gradually in order to ensure they make gains in their fitness program. a person who doesn't utilize the progression principle can still gain health benefits from exercising, but will not continue to improve in cardiovascular fitness.