Q. No.Under normal resting conditions, the amount of air that is actually available for exchange of gases is approximately:
1. 150 ml
2. 350 ml
3. 500 ml
4. 650 ml
1. 150 ml
2. 350 ml
3. 500 ml
4. 650 ml
A person has a respiratory rate of 12 breaths per minute and an anatomical dead space of 150 ml. How much air is not involved in gas exchange per minute?
1. 500 mL/min
2. 1800 mL/min
3. 4200 mL/min
4. 6000 mL/min
What is the partial pressure of oxygen and carbon dioxide respectively in the venous blood leaving the tissues [in mm of Hg]?
| 1. 104, 40 | 2. 95, 40 |
| 3. 40, 45 | 4. 20, 46 |
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Why is oxygen transport affected in carbon monoxide poisoning?
1. More carbonic acid will be produced, and the hemoglobin will give up more oxygen to the tissue.
2. Hemoglobin will bind to less oxygen, and hemoglobin will not release as much oxygen to the tissue.
3. Carbon monoxide makes hemoglobin give up oxygen more readily in the tissues.
4. Carbon monoxide ties up hemoglobin's ability to bind to oxygen, but more hemoglobin will be produced, so no decline in oxygen in the tissue will be noticed.
The dorsal respiratory group of the respiratory center in the brain stem stimulates:
| 1. external intercostals | 2. internal intercostals |
| 3. diaphragm | 4. rectus abdominus |
Condition of the body in which the tissues are starved of oxygen is called as:
| 1. apnea | 2. hypocapnia |
| 3. hypoxia | 4. hypercapnia |
Some pathogens can reach the alveoli, they can still be destroyed by:
1. macrophages in the pulmonary lymph nodes
2. NK cells in the elastic tissues of the lungs
3. cytotoxic T-lymphocytes
4. alveolar macrophages
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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Oxygenated blood through the tissues of the lungs is carried by:
1. pulmonary and bronchial veins
2. pulmonary and bronchial arteries
3. pulmonary veins and bronchial arteries
4. pulmonary arteries and bronchial veins
Vagal stimulation would lead to:
1. deeper inhalation
2. forced exhalation
3. bronchodilation
4. bronchoconstriction
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