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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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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The alveoli are lined with:
1. Simple cuboidal epithelium
2. Pseudo-stratified columnar ciliated epithelium
3. Transitional epithelium
4. Simple squamous epithelium
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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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