| 1. 1 pts. |
Through which sequence of structures does air pass on its way to the gas-exchange surfaces in the lungs? | |
| A. | trachea → bronchioles → bronchus | |
| B. | trachea → bronchus → bronchioles | |
| C. | bronchus → trachea → bronchioles | |
| D. | bronchus → bronchioles → trachea | |
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| 2. 1 pts. |
In which structure does gas exchange take place? | |
| A. | bronchiole | |
| B. | trachea | |
| C. | bronchus | |
| D. | alveolus | |
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| 3. 1 pts. |
The gases exchanged at the gas-exchange surfaces in the lungs are | |
| A. | carbon dioxide and air | |
| B. | nitrogen and carbon dioxide | |
| C. | oxygen and air | |
| D. | oxygen and carbon dioxide | |
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| 4. 1 pts. |
At the gas exchange surfaces in the lungs oxygen passes into the | |
| A. | alveoli because there is a lower concentration of oxygen in the blood | |
| B. | into the blood because there is a lower concentration of oxygen in the alveoli | |
| C. | into the blood because there is a higher concentration of oxygen in the alveoli | |
| D. | alveoli because there is a higher concentration of oxygen in the blood | |
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| 5. 1 pts. |
At the gas exchange surfaces in the lungs, carbon dioxide passes into the | |
| A. | alveoli because there is a higher concentration of carbon dioxide in the blood | |
| B. | bloodi because there is a higher concentration of carbon dioxide in the alveoli | |
| C. | alveoli because there is a lower concentration of carbon dioxide in the blood | |
| D. | blod because there is a lower concentration of carbon dioxide in the blood | |
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| 6. 1 pts. |
Which set of features makes gas exchange most efficient? | |
| A. | many alveoli, good blood supply, thick alveolar walls | |
| B. | good blood supply, thin alveolar walls, moist alveolar surface | |
| C. | thin alveolar walls, few alveoli, good blood supply | |
| D. | poor blood supply, many alveoli, thick alveoli walls | |
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| 7. 1 pts. |
A large gas exchange surface is achieved by the presence of | |
| A. | few alveoli | |
| B. | moist alveoli | |
| C. | many alveoli | |
| D. | large alveoli | |
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| 8. 1 pts. |
Oxygen passes easily from the alveoli into the blood because the | |
| A. | alveolar and capillary walls are thin | |
| B. | alveolar wall is thin and the capillary wall is thick | |
| C. | alveolar wall is thick and capillary wall is thin | |
| D. | alveolar wall and capillary wall is thick | |
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| 9. 1 pts. |
The main function of red blood cells is to carry | |
| A. | oxygen | |
| B. | glucose | |
| C. | carbon dioxide | |
| D. | amino acids | |
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| 10. 1 pts. |
Structural features which help red blood cells carry out their function efficiently include | |
| A. | absence of a nculeus and a biconvex shape | |
| B. | presence of a nculeus and a biconvex shape | |
| C. | absence of a nculeus and a biconcave shape | |
| D. | presence of a nculeus and a biconvex shape | |
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| 11. 1 pts. |
What is the name of the pigment which give red blood cells their colour | |
| A. | deoxyhaemoglobin | |
| B. | haemoglobin | |
| C. | haemocyte | |
| D. | haemoxyglobin | |
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| 12. 1 pts. |
Carbon dioxide is carried in the blood | |
| A. | in red blood cells only | |
| B. | in red blood cells and white blood cells | |
| C. | dissolved in plasma and in red blood cells | |
| D. | dissolved in plasma and white blood cells | |
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| 13. 1 pts. |
Too much carbon dioxide dissolved in the blood would make the blood too | |
| A. | thin | |
| B. | acidic | |
| C. | alkaline | |
| D. | thick | |
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| 14. 1 pts. |
Digested food products are carried in the blood | |
| A. | by red blood cells | |
| B. | by white blood cells | |
| C. | dissolved directly in the plasma | |
| D. | as soluble bicarbonate | |
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