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Grades 6, 7 and 8 - Science - Middle School - Respiration
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Avg score: 62% • Most missed: “The percentage of carbon dioxide in inhaled air is .......”

Respiration is the process by which oxygen is delivered from the environment to the cells for cellular exchange. In its proper terminology, it includes the entire process. In terms of visibility, respiration is simply a term for breathing. When breathing (respiration) takes place, oxygen is taken in from the air and carbon dioxide and water vapor are breathed out...
 

Grades 6, 7 and 8 - Science - Middle School - Respiration
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20 Questions

1. The percentage of carbon dioxide in exhaled air is .......
2. For aerobic respiration, which two substances are needed?
3. Air can enter and leave the lungs because .......
4. Gas exchange takes place in the alveoli. Which is not true?
5. Which is the correct order showing how oxygen enters the blood?
6. Oxygen is transported to all parts of the body by .......
7. The percentage of oxygen in the air breathed out is .......
8. When we inhale which one of the following is NOT correct?
9. Respiration occurs in .......
10. The trachea (windpipe) is kept open because it is made of rings of .......
11. Which of the following is NOT involved in removing carbon dioxide from the body?
12. When we exhale which one of the following is NOT correct?
13. The percentage of oxygen in the air breathed in is .......
14. The percentage of which gas remains unchanged?
15. Which of the following is NOT true about the effect of exercise?
16. The diaphragm is .......
17. Carbon dioxide passes into the alveoli from .......
18. Which of the following are products of respiration?
19. The percentage of carbon dioxide in inhaled air is .......
20. Oxygen passes from the alveoli into the blood. How is it transported?

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