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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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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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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I: | Lower invertebrates like sponges, coelenterates and flatworms exchange oxygen with carbon dioxide by simple diffusion over their entire body surface. |
II: | Fishes are the only vertebrates that do not use lungs as respiratory organs. |
1. | Only I is correct | 2. | Only II is correct |
3. | Both I and II are correct | 4. | Both I and II are incorrect |
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Which of the following is not correctly matched?
I: | Thoracic chamber is formed dorsally by | Sternum |
II: | Thoracic chamber is formed ventrally by | Vertebral column |
III: | Thoracic chamber is formed laterally by | Ribs |
IV: | Thoracic chamber is formed on the lower side by | Diaphragm |
1. | I and II only | 2. | II only |
3. | III and IV only | 4. | I, II, III and IV |
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