Select the answer that best fits the following description. Muscular endurance training is done in a series of approximately 10 exercises. Machines or stations are set up in a circle and the person goes from one station to the next doing 10-15 repetitions and completing the circle 2 to 3 times. The exercises are low to moderate resistance. a. Aerobic trainingb. Circuit trainingc. Weigh liftingd. Pilates

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.