Please help!! This is a P. e question 1. In order for your body to make the physiological changes to improve itself, which concept/s must be applied regularly?

2. In order for you to improve your speed, you must use exercises that directly address it. Which principle is this?

3. When your body becomes accustomed to a specific demand, the demand must be systematically increased. Which principle is this?

You don't have to answer all of them anything will help.

Which of these is a controllable risk fator for disease

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.

Stress at moderate levels that produces positive results is