Q. No.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
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 |
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 |
When the diaphragm or external intercostal muscles contract, intrapulmonary pressure should
| 1. | increase | 2. | decrease |
| 3. | remain constant | 4. | equal atmospheric pressure |
During deglutition, the food is prevented from entering into the larynx by the cartilaginous:
| 1. epiglottis | 2. glottis |
| 3. aryepiglottic fold | 4. laryngeal prominence |
1. 2nd thoracic vertebra
2. 3rd thoracic vertebra
3. 5th thoracic vertebra
4. 12th thoracic vertebra
Regarding pulmonary capacities, the maximum volume of air a person can breathe in after a forced expiration can also be defined as:
| 1. | Total volume of air a person can inspire or expire after a normal inspiration or expiration |
| 2. | Volume of air that will remain in the lungs after a normal expiration |
| 3. | Maximum volume of air a person can breathe out after a forced inspiration |
| 4. | Total volume of air accommodated in the lungs at the end of a forced inspiration |
The binding of oxygen with hemoglobin is primarily related to:
| 1. | Partial pressure of carbon dioxide |
| 2. | Partial pressure of oxygen |
| 3. | H+ ion concentration in body fluids |
| 4. | Presence of 2,3-DPG in erythrocytes |
Under normal physiological conditions, what amount of oxygen is delivered to the tissues?
| 1. | 4 ml | 2. | 5 ml |
| 3. | 15 ml | 4. | 20 ml |
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