List the eight different systems of the human body: 1. 2. 3. 4. 5. 6. 7. 8. next, list your pet or favorite animal here:

Describe the concept of interval training. what is the benefit of this type of training?

This is one popular brand of exercise machine

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.