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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
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 |
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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Identify the wrong statement with reference to the transport of oxygen.
| 1. | Partial pressure of CO2 can interfere with O2 binding with haemoglobin. |
| 2. | Higher H+ conc. in alveoli favours the formation of oxyhaemoglobin. |
| 3. | Low pCO2 in alveoli favours the formation of oxyhaemoglobin. |
| 4. | Binding of oxygen with haemoglobin is mainly related to partial pressure of O2. |
The respiratory system does not:
1. allow oxygen from the air to enter the blood and carbon dioxide to leave the blood and enter the air.
2. alter the pH by changing oxygen levels.
3. provide protection against some microorganisms by preventing their entry into the body and by removing them from respiratory surfaces.
4. allow for speech and sound generation.
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
Match the following columns and select the correct option :
| Column I | Column II | ||
| (a) | Pneumotaxic centre | (i) | Alveoli |
| (b) | O2 dissociation curve | (ii) | Pons region of the brain |
| (c) | Carbonic anhydrase | (iii) | Haemoglobin |
| (d) | Primary site of exchange of gases | (iv) | R.B.C. |
| (a) | (b) | (c) | (d) | |
| 1. | (i) | (iii) | (ii) | (iv) |
| 2. | (ii) | (iii) | (iv) | (i) |
| 3. | (iii) | (ii) | (iv) | (i) |
| 4. | (iv) | (i) | (iii) | (ii) |
Oxygen binding to haemoglobin in blood is
1. directly proportional to the concentration of in the medium
2. inversely proportional to the concentration of in the medium
3. directly proportional to the concentration of CO in the medium
4. independent of the concentration of CO in the medium
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| 1. | Partial pressure of oxygen in alveolar air | 104 mm Hg |
| 2. | Partial pressure of carbon dioxide in deoxygenated blood | 45 mm Hg |
| 3. | Transport of carbon dioxide in blood as bicarbonate | 70 % |
| 4. | Transport of carbon dioxide as carbaminohemoglobin | 7 % |
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Q. No.
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