Q. No.Name the cavities in which the lungs are located:
1. pleural and abdominal cavities.
2. pericardial and thoracic cavities.
3. pleural and thoracic cavities.
4. pleural and pericardial cavities.
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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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During deglutition, the food is prevented from entering into the larynx by the cartilaginous:
| 1. epiglottis | 2. glottis |
| 3. aryepiglottic fold | 4. laryngeal prominence |
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Most of the aquatic arthropods respire through:
| 1. diffusion over entire body surface | 2. gills |
| 3. tracheae and tracheoles | 4. skin |
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The trachea divides into a right and a left primary bronchus at the level of:
| 1. 2nd thoracic vertebra | 2. 3rd thoracic vertebra |
| 3. 5th thoracic vertebra | 4. 12th thoracic vertebra |
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Branchial respiration is seen in all the following except:
| 1. Aquatic arthropods | 2. Fishes |
| 3. Amphibians like frog | 4. Aquatic mollusks |
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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 |
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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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I: P is an incomplete cartilaginous ring seen only in trachea and principal bronchus.
II: Q is the point where the trachea divides into a right and left primary bronchus and corresponds to the level of 5th thoracic vertebra.
III: R shows the double-layered pleura where the outer pleural membrane is in close contact with the thoracic lining.
IV: S is pleural cavity with minimal amount of pleural fluid which reduces friction on the lung surface.
| 1. Only I, II and III | 2. Only I, III and IV |
| 3. Only II, III and IV | 4. I, II, III and IV |
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Consider the following two statements:
| I: | The lungs are situated in the thoracic chamber which is anatomically an air-tight chamber. |
| II: | This arrangement is essential as we cannot directly alter the thoracic volume. |
| 1. | Both I and II are correct and II correctly explains I |
| 2. | Both I and II are correct but II does not explain I |
| 3. | I is correct and II is incorrect |
| 4. | Both I and II are incorrect |
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