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Directions: Write only the letter of the correct answer. 1. Which part of the circulatory system pumps blood throughout the body? a. Blood b. blood vessel c. heart 2. What type of blood vessel carries the blood away from the heart? a. Artery b. Capillary C. vein 3. What happens to the diaphragm when a person breathes in or inhales? a. The diaphragm relaxes. C. The diaphragm contracts. b. The diaphragm constricts. 4. Which part of the respiratory system serves as an important site of gas exchange? a. Alveolus b. Bronchiole c. trachea 5. The following statements are functions of the respiratory system EXCEPT a. breathing b. metabolize carbohydrates c, filters air 6. If the blood from the heart needs to be oxygenated, through which blood vessel will it need to pass? a. Aorta b. pulmonary vein c. pulmonary artery 7. What does the circulatory system distribute to the body as it works with the respiratory system? a. Blood b. oxygen C. water 8. Which of the following is not a benefit that the circulatory system gets from exercise? a. Increased distribution/absorption of oxygen C. Thinning of mucus secretions b. Efficiency of blood circulation 9. All of the following are good ways in preventing cardio-respiratory diseases EXCEPT a. proper exercise b. balanced diet C. drinking alcohol regularly 10. Why does our heart beat faster when you exercise? a. Because our body needs more oxygen c. Because our body needs more water b. Because our body is dehydrated
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