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.
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 |
During deglutition, the food is prevented from entering into the larynx by the cartilaginous:
1. epiglottis | 2. glottis |
3. aryepiglottic fold | 4. laryngeal prominence |
Most of the aquatic arthropods respire through:
1. diffusion over entire body surface | 2. gills |
3. tracheae and tracheoles | 4. skin |
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 |
Branchial respiration is seen in all the following except:
1. Aquatic arthropods | 2. Fishes |
3. Amphibians like frog | 4. Aquatic mollusks |
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 |
Incomplete cartilaginous rings are seen in the walls of all the following except:
1. Trachea | 2. Primary bronchus |
3. Tertiary bronchus | 4. Respiratory bronchiole |
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 |
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 |