Q. No.The formation of oxy-hemoglobin at the alveoli is favored by all the following except:
1. High pO2
2. Low pCO2
3. Lower H+ ion concentration
4. Higher temperature
The sum of expiratory reserve volume [ERV] and residual volume [RV] corresponds to:
| 1. Expiratory capacity | 2. Vital capacity |
| 3. Functional residual capacity | 4. Total lung capacity |
The major mode of transport of carbon dioxide in human body is:
| 1. | in combination with hemoglobin |
| 2. | in dissolved state in plasma |
| 3. | as carboxyhemoglobin |
| 4. | as bicarbonate |
The duration of inspiration can be reduced by:
| 1. | an increase of carbon dioxide in blood |
| 2. | a chemical signal from aortic and carotid bodies |
| 3. | a neural signal from pneumotaxic center |
| 4. | an increase in hydrogen ion concentration in CSF |
The conducting part of the human respiratory system is not involved in:
| I: | clearing inhaled air from foreign particles |
| II: | humidifying the exhaled air |
| III: | bringing the air to a temperature higher than body temperature |
| 1. | Only I | 2. | Only II and III |
| 3. | Only I and II | 4. | I, II and III |
Which of the following is higher in value?
| 1. | Amount of carbon dioxide delivered by 100 ml of blood at lungs than amount of oxygen delivered by 100 ml of blood at tissues |
| 2. | Amount of carbon dioxide transported by hemoglobin than amount of oxygen transported by hemoglobin |
| 3. | The diffusing capacity of carbon dioxide across the respiratory membrane than the diffusing capacity of oxygen across the respiratory membrane |
| 4. | Alveolar ventilation than the minute ventilation |
The value of partial pressure of oxygen in alveolar air is:
1. less than that in oxygenated blood
2. more than that in atmospheric air
3. equal to that in oxygenated blood
4. more than that in tissues
The graph below shows tracing of pulmonary volumes during spirometery of a person. Identify A, B, C and D respectively:
1. IRV, TV, ERV and RV
2. IRV, TV, RV and ERV
3. ERV, TV, IRV and RV
4. ERV, IRV, RV and TV
The trachea divides into a right and a left primary bronchi at the level of:
1. 3rd thoracic vertebra
2. 5th thoracic vertebra
3. 7th thoracic vertebra
4. 12th thoracic vertebra
Incomplete cartilaginous rings are seen in the walls of all the following except:
| 1. Trachea | 2. Primary bronchus |
| 3. Tertiary bronchus | 4. Respiratory bronchiole |
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