1.
5.b A) alveoli B) diaphragm C) lung D) sternum 2.
5.b A) nose or mouth--lungs--bronchi--trachea B) nose or mouth--trachea--lungs--bronchi C) nose or mouth--trachea--bronchi--lungs D) nose or mouth--lungs--trachea--bronchi 3.
5.b A) bronchi B) alveoli C) bronchioles D) trachea 4.
5.b A) obstruction of the trachea B) food allergies C) air pollution D) pneumonia 5.
, 5.b A) sphere B) flattened disc C) cylinder D) long, flat rectangle 6.
5.a, 5.b A) They wear out and are replaced by your body every two months. B) They last for many years, getting bigger as they grow older. C) They last for about 20 hours before being replaced by your body. D) They carry carbon dioxide from your lungs to all parts of your body. 7.
6.j A) lungs B) right atrium C) right ventricle D) left ventricle 8.
5.a, 5.b A) being overweight B) exercises that raise the heart rate C) eating a diet high in fat and cholesterol D) smoking 9.
5.a, 5.b A) Oxygen flows out of the blood and into the lungs. B) Carbon dioxide flows out of the lungs and into the blood. C) Carbon dioxide flows out of the blood and into the lungs. D) Oxygen flows out of the left and right ventricles and into the lungs. 10.
6.j A) Blood flows due to the force of gravity pushing it through the body. B) Blood is pumped through the body by the heart. C) Blood is carried through the body by the gases brought in through the lungs. D) Blood does not move through the body unless an injury causes blood to flow out of the body. 11.
5.a, 5.b A) Asthma makes breathing difficult because the airways swell, making them narrower. B) Asthma reduces the amount of blood the heart pumps to the lungs. C) Asthma causes tumors to form on the lungs. D) Asthma causes an infection that prevents gas exchange in the lungs. 12.
5.a, 5.b A) pneumonia B) asthma C) hypertension D) cystic fibrosis 13.
5.a, 5.b A) heart-vein-capillary-artery B) heart-capillary-artery-vein C) heart-artery-capillary-vein D) hear-artery-vein-capillary 14.
6.j A) gas pressure B) gravity C) blood pressure D) valves 15.
5.a, 5.b A) right ventricle B) left atrium C) right atrium D) left ventricle
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