Q. No.The diffusion of gases in lungs occur across the respiratory membrane. Which of the following is incorrect regarding the respiratory membrane?
1. it is the only barrier between the blood and the inhaled gases within each alveolus
2. basement membranes of alveolar type I cells and their adjacent capillaries are fused
3. oxygen cannot diffuse through the membrane and so must be actively transported
4. carbon dioxide diffuses across the membrane from the blood into the alveolar lumen
Alveoli are tiny, balloon-shaped air sacs that sit at the very end of the respiratory tree, branching off the _______.
| 1. tertiary bronchi | 2. bronchioles |
| 3. terminal bronchioles | 4. respiratory bronchioles |
What is true about RBCs in humans?
1. They carry about 20-25 percent of
2. They transport 99.5 percent of
3. They transport about 80 percent oxygen only and the rest 20 percent of it is transported in a dissolved state in blood plasma
4. They do not carry at all
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What is the state that describes the hemoglobinic acid?
| 1. | oxidized | 2. | hydrated |
| 3. | reduced | 4. | hyper |
Pulmonary fibrosis is a characteristic feature of all cases of:
| 1. | Occupational lung diseases | 2. | Bronchial asthma |
| 3. | Emphysema | 4. | Pneumonia |
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Asthma may be attributed to?
1. allergic reaction of the mast cells in the lungs
2. inflammation of the trachea
3. accumulation of fluid in the lungs
4. bacterial infection of the lungs
All the following are favorable for the formation of oxyhemoglobin at the lungs except:
| 1. | High PO2 | 2. | Low PCO2 |
| 3. | Low temperature | 4. | Low pH |
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The given graph shows the pulmonary volumes of a healthy man recorded on spirometer.
Which of the following would be correct?
1. D can be exhaled only after maximum expiratory efforts
2. The value of B will be different for inhalation and exhalation
3. The amount of air remaining in lungs after a normal exhalation is C + D
4. Total lung capacity cannot be calculated from this graph as it includes residual volume
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| I. Alveolar epithelium | II. Vascular endothelium |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Condition of the body in which the tissues are starved of oxygen is called as:
| 1. apnea | 2. hypocapnia |
| 3. hypoxia | 4. hypercapnia |
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