An athlete's arousal level refers to

a. the "mind-set" of the athlete in reference to competition and intensity of the exercise or sport.
b. how well rested the athlete is before competition.
c. the methods by which the athlete prepared him/herself for competition.
d. the type of equipment the athlete uses during competition.

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.