I feel like I shouldn't have to say this, but I want everyone to understand. (If you do GREAT <3) Don't join people's Zooms. There is a guy going around asking people to Zoom, (look out for the code: 825 338 1513) then when they get on, he asks them to show their bodies/other innapropriate things. His name on Zoom is "Mysterious Men" Please stay safe guys, these are strangers, not your friends. If you can, repost this. If you feel the need, report this question. I just want to raise some awareness.

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.