Which are the three most common stis in the united states?

a. chlamydia, genital herpes, and gonorrhea
b. chlamydia, human papilloma virus, and syphilis
c. gonorrhea, syphilis, and trichomoniasis
d. chlamydia, human papilloma virus, and trichomoniasis

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.