Directions: During cardiorespiratory activity, physiological changes occur in the body. Circle T for true or F for false according to whether each change happens during exercise. 1. T or F Heart rate decreases . 2. T F The heart pumps more blood with each beat. 3. T F Blood flow to the working muscles increases . 4. T or F Blood flow to the lungs decreases . 5. T or F Breathing rate increases. 6. T or F Blood low to the heart musce itself increases 7. T or F Blood flow to the digestive organs decreases 8. T or F Blood to the skin increases to carry away excess hear and cool the body 9. T or F The body uses carbohydrates and fat for energy at a slower rate. 10. T or FBlood carries oxygen and food to working muscles at a faster rate.