Yo can you NOT delete my personal questions? I really feel like you mods don't care for children's mental health. Some kids' feel like they can't tell their parents or friends their problem so they ask strangers for advice. The reason why people like me do this is because they don't really care if strangers judge them since they won't really see them again and the stranger doesn't actually know who they are. So basically, can you just stop deleting questions for MENTAL HEALTH??

Check all that occur during ventricular systole. a. the av valves open to allow blood to enter the ventricles from the atria. b. the av valves open to allow blood to enter the ventricles from the atria. c. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. d. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. e. the semilunar valves open to allow blood to flow into the large arteries. f. the semilunar valves open to allow blood to flow into the large arteries. g. the av valves close to prevent backflow of blood into the atria.