1. A man has a headache, he is dizzy, and has numbness on one side of his body. What may he be suffering from
2. A girl is sweating heavily, has cold clammy skin, feels nauseated and is dizzy. She may be suffering from what?
3. A man in his late 50’s has pain in his chest, difficulty breathing, starts sweating, and has indigestion. What may he be suffering from?

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.