(06.04 lc) what are the first steps in hands-only cpr? check for safety, see if the person is responsive, look for breathing, and call 911. call 911, look for breathing, check for safety, and see if the person is responsive. look for breathing, check for safety, call 911, and see if the person is responsive. see if the person is responsive, check for safety, call 911, and look for breathing.

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.