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Q. No.Both carbon dioxide and oxygen move across the respiratory membrane due to:
| 1. | gravity | 2. | blood pressure |
| 3. | diffusion | 4. | active transport |
With respect to the atmospheric air, the deoxygenated blood flowing into lung capillaries has a higher concentration of:
| 1. oxygen | 2. both carbon dioxide and oxygen |
| 3. carbon monoxide | 4. carbon dioxide |
Gas exchange in the human lungs takes place across the respiratory membrane which is made up of:
| 1. | alveolar macrophages and the alveolar cell membrane |
| 2. | alveolar cell membrane and its basement membrane |
| 3. | alveolar cell membrane and capillary membrane |
| 4. | alveolar cell membrane, capillary membrane, and fused basement membranes |
When compared with carbon dioxide, the partial pressure of oxygen in the air and its solubility in water is respectively:
| 1. | lower, lower | 2. | lower, higher |
| 3. | greater, lower | 4. | greater, higher |
What is the partial pressure of oxygen and carbon dioxide respectively in the venous blood leaving the tissues [in mm of Hg]?
| 1. | 104, 40 | 2. | 95, 40 |
| 3. | 40, 45 | 4. | 20, 46 |
The partial pressure of oxygen in oxygenated blood is about:
| 1. 104 mmHg | 2. 100 mmHg |
| 3. 95 mmHg | 4. 40 mmHg |
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% |
The conversion of carbon dioxide into carbonic acid in the red blood cells is catalyzed by the enzyme:
| 1. hemoglobin | 2. carbonic anhydrase |
| 3. carbonic oxidoreductase | 4. carbonic transferase |
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Q. No.
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