Q. No.Given are the results of a pulmonary function test of a normal healthy male:
A. A resting tidal volume of 500 ml.
B. An anatomic dead space of 150 ml.
C. Breathing rate of 10 breaths/minute.
D. A total lung capacity of 6000ml.
E. A residual volume of 1000ml.
Which of the following statements is correct?
1. His alveolar ventilation would be 6.5 L/minute
2. Doubling the breathing rate would double his alveolar ventilation
3. Doubling the depth of respiration (tidal volume would double his alveolar ventilation)
4. His vital capacity is 5500ml
A. A resting tidal volume of 500 ml.
B. An anatomic dead space of 150 ml.
C. Breathing rate of 10 breaths/minute.
D. A total lung capacity of 6000ml.
E. A residual volume of 1000ml.
Which of the following statements is correct?
2. Doubling the breathing rate would double his alveolar ventilation
3. Doubling the depth of respiration (tidal volume would double his alveolar ventilation)
4. His vital capacity is 5500ml
The total volume of the conducting airways from the nose or mouth down to the level of the terminal bronchioles [about 150ml] which is not capable of exchanging gases with the blood, is referred to as
1. Physiological dead space
2. Anatomical dead space
3. Alveolar dead space
4. Respiratory zone dead space
During the passage of blood through a tissue with normal metabolism, the percentage of hemoglobin that unloads oxygen is approximately:
| 1. | 10% | 2. | 25% |
| 3. | 50% | 4. | 75% |
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Which of the following is applicable to a change in the affinity of hemoglobin for oxygen?
1. Decreased in rapidly metabolizing tissues
2. Increased at higher than normal body temperatures
3. Increased at higher than normal blood 2,3-DPG levels
4. Decreased at more basic than normal blood pH
What is the number of lobes in the right and the left lungs respectively?
| 1. two, one | 2. two, three |
| 3. three, two | 4. four, three |
During expiration, the diaphragm and external intercostal muscles are:
1. contracted
2. relaxed
3. flexed
4. both relaxed (diaphragm) and flexed (intercostal muscles)
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The respiratory center in humans can be primarily stimulated by:
1. carbon dioxide and hydrogen ions
2. oxygen gas levels in the blood
3. oxygen gas levels in the hemoglobin
4. conscious feeling for the need for more oxygen
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The peripheral chemoreceptors in carotid and aortic bodies respond to:
1. hydrogen ion concentration.
2. levels of carbon dioxide in the blood.
3. levels of oxygen in the blood.
4. all of the above
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What will happern to the rate and depth of breathing when blood carbon dioxide rises?
| 1. | decreases | 2. | increases |
| 3. | stays the same | 4. | stops |
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Both carbon dioxide and oxygen move across the respiratory membrane due to:
| 1. | gravity | 2. | blood pressure |
| 3. | diffusion | 4. | active transport |
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