Q. No.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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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 |
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Hemoglobin carrying carbon dioxide is called as:
| 1. Deoxyhemoglobin | 2. Carbaminohemoglobin |
| 3. Carboxyhemoglobin | 4. Oxyhemoglobin |
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A measure of the amount of air a person inhales during a normal breath is:
| 1. inspiratory reserve volume | 2. vital capacity |
| 3. total lung capacity | 4. tidal volume |
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The amount of air that remains in a person's lungs after fully exhaling is known as:
| 1. tidal volume | 2. expiratory reserve volume |
| 3. vital capacity | 4. residual volume |
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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
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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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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 |
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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 |
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A minimal amount of pleural fluid present in the pleural cavity:
| 1. | provides a medium for the exchange of respiratory gases |
| 2. | reduces friction between the visceral and parietal pleurae |
| 3. | provides lubrication for movements of the diaphragm |
| 4. | permits the exchange of electrolytes during respiration |
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