Q. No.Transport of gases in alveoli takes place by:
| 1. Active transport | 2. Passive transport |
| 3. Simple diffusion | 4. None of the above |
Subtopic: Respiratory System: Exchange of Gases |
86%
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AIPMT - 1998
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Exchange of gases occurs across the respiratory membrane. Which of the following would increase the rate of diffusion of a gas across the respiratory membrane?
| 1. | respiratory membrane becomes thicker. |
| 2. | surface area of the respiratory membrane decreases. |
| 3. | partial pressure difference of the gas across the respiratory membrane increases. |
| 4. | diffusion coefficient of the gas decreases. |
Subtopic: Respiratory System: Exchange of Gases |
84%
From NCERT
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With respect to the atmospheric air, the deoxygenated blood flowing into lung capillaries has a higher concentration of:
| 1. oxygen | 2. both carbon dioxide and oxygen |
| 3. carbon monoxide | 4. carbon dioxide |
Subtopic: Respiratory System: Exchange of Gases |
78%
From NCERT
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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 |
Subtopic: Respiratory System: Exchange of Gases |
85%
From NCERT
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The partial pressure of oxygen in oxygenated blood is about:
| 1. 104 mmHg | 2. 100 mmHg |
| 3. 95 mmHg | 4. 40 mmHg |
Subtopic: Respiratory System: Exchange of Gases |
86%
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Which of the following will not be equal in normal physiological conditions?
| 1. | Partial pressure of oxygen in deoxygenated blood and partial pressure of oxygen in tissues |
| 2. | Partial pressure of carbon dioxide in alveoli and partial pressure of carbon dioxide in oxygenated blood |
| 3. | Partial pressure of oxygen in oxygenated blood and partial pressure of oxygen in alveoli |
| 4. | Partial pressure of carbon dioxide in tissues and partial pressure of carbon dioxide in deoxygenated blood |
Subtopic: Respiratory System: Exchange of Gases |
68%
From NCERT
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The value of partial pressure of oxygen in alveolar air is:
1. less than that in oxygenated blood
2. more than that in atmospheric air
3. equal to that in oxygenated blood
4. more than that in tissues
Subtopic: Respiratory System: Exchange of Gases |
80%
From NCERT
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Consider the given two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | pO2 in alveolar air is less than the pO2 in atmospheric air. |
| Statement II: | pCO2 in alveolar air is less than the pCO2 in atmospheric air. |
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Respiratory System: Exchange of Gases |
79%
From NCERT
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O2 and CO2 are exchanged by simple diffusion mainly based on pressure/concentration gradient at:
I: Alveoli
II: Tissues
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
I: Alveoli
II: Tissues
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Respiratory System: Exchange of Gases |
88%
From NCERT
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Where do you expect the partial pressure of oxygen to be the highest?
1. in the alveolar air
2. in the deoxygenated blood
3. in the oxygenated blood
4. at tissues
1. in the alveolar air
2. in the deoxygenated blood
3. in the oxygenated blood
4. at tissues
Subtopic: Respiratory System: Exchange of Gases |
90%
From NCERT
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