- 1(current)
Q. No.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) |
Transport of gases in alveoli takes place by:
| 1. Active transport | 2. Passive transport |
| 3. Simple diffusion | 4. None of the above |
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What will be the partial pressure of oxygen in a mixture of gases where the total pressure is 500 mmHg and oxygen comprises 20% of the gas mixture?
| 1. 0.1 mm Hg | 2. 10 mm Hg |
| 3. 100 mm Hg | 4. 200 mm Hg |
The volume of air that is available for gas exchange each minute is the
1. minute ventilation
2. anatomical dead air space
3. physiological dead air space
4. alveolar ventilation
People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude of 5400 metres have around 8 million. This is because at high altitude:
1. people get pollution-free air to breathe and more oxygen is available
2. atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive
3. there is more UV radiation which enhances RBC production
4. people eat more nutritive food, therefore more RBCs are formed
Which one of the following statements is incorrect?
1. The residual air in lungs slightly decreases the efficiency of respiration in mammals
2. The presence of non-respiratory air sacs increases the efficiency of respiration in birds
3. In insects, circulating body fluids serve to distribute oxygen to tissues
4. The principle of counter current flow facilitates efficient respiration in gills of fishes
- 1(current)
Q. No.
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