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Q. No.At about what partial pressure of oxygen [mm Hg] is the haemoglobin in blood 50% saturated?
1.
95
2.
75
3.
27
4.
15
Subtopic: Â Respiratory System: Transport of Gases |
From NCERT
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In tissues:
1. a and b are correct
2. a and d are correct
3. b and c are correct
4. c and d are correct
| a. | pCO2 is high and pO2 is low |
| b. | dissociation of CO2 from carbamino-haemoglobin takes place |
| c. | pCO2 is low and pO2 is high |
| d. | more binding of carbon dioxide to haemoglobin occurs |
1. a and b are correct
2. a and d are correct
3. b and c are correct
4. c and d are correct
Subtopic: Â Respiratory System: Exchange of Gases |
 84%
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Regarding the chemical regulation of respiration in humans:
1. Only I and II are correct
2. Only II and III are incorrect
3. I, II and III are incorrect
4. Only I and III are correct
| I: | A chemosensitive area is situated adjacent to the rhythm centre which is highly sensitive to CO2 and hydrogen ions. |
| II: | Receptors associated with aortic arch and carotid artery can recognise changes in O2 concentration and send necessary signals to the rhythm centre for remedial actions. |
| III: | The role of oxygen in the regulation of respiratory rhythm is most significant. |
2. Only II and III are incorrect
3. I, II and III are incorrect
4. Only I and III are correct
Subtopic: Â Respiratory System: Exchange of Gases |Â Respiratory System: Regulation of Respiration |
 59%
From NCERT
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A chronic disorder in which alveolar walls are damaged due to which respiratory surface is decreased will be:
| 1. | Emphysema | 2. | Asthma |
| 3. | Tuberculosis | 4. | Common cold |
Subtopic: Â Respiratory Disorders - III |
 92%
From NCERT
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The lungs are covered by the pleural membranes which mainly help in:
1. maintaining pressure
2. increasing thoracic pressure
3. removing foreign particles
4. reducing friction
1. maintaining pressure
2. increasing thoracic pressure
3. removing foreign particles
4. reducing friction
Subtopic: Â Respiratory System: Trachea & Basic Anatomy of Lung |Â Respiratory Organs |
 88%
From NCERT
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Consider the two statements:
1. Statement I is correct: Statement II is incorrect
2. Statement I is incorrect: Statement II is correct
3. Statement I is correct: Statement II is correct
4. Statement I is incorrect: Statement II is incorrect
| Statement I: | The alveoli have ciliated cells in them to help expel dust particles that make it this far down into the respiratory tract. |
| Statement II: | Gas exchange between the lungs and the blood, and between the blood and tissue fluid, is an active transport process. |
1. Statement I is correct: Statement II is incorrect
2. Statement I is incorrect: Statement II is correct
3. Statement I is correct: Statement II is correct
4. Statement I is incorrect: Statement II is incorrect
Subtopic: Â Respiratory System: Trachea & Basic Anatomy of Lung |
 55%
From NCERT
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Consider the two statements:
1. Statement I is correct: Statement II is incorrect
2. Statement I is incorrect: Statement II is correct
3. Statement I is correct: Statement II is correct
4. Statement I is incorrect: Statement II is incorrect
| Statement I: | Intrapulmonary pressure must be greater than atmospheric pressure for air to enter the lungs. |
| Statement II: | Intrapulmonary pressure must be lower than atmospheric pressure for air to be exhaled out of the lungs. |
1. Statement I is correct: Statement II is incorrect
2. Statement I is incorrect: Statement II is correct
3. Statement I is correct: Statement II is correct
4. Statement I is incorrect: Statement II is incorrect
Subtopic: Â Respiratory System: Transport of Gases Part 1 |Â Respiratory System: Transport of Gases Part 2 |Â Respiratory System: Transport of Gases |
 89%
From NCERT
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Consider the two statements:
1. Statement I is correct: Statement II is incorrect
2. Statement I is incorrect: Statement II is correct
3. Statement I is correct: Statement II is correct
4. Statement I is incorrect: Statement II is incorrect
| Statement I: | The pO2 of the blood normally has no direct effect on respiration. |
| Statement II: | The pO2 of the oxygenated blood is higher than the pO2 of the alveolar air. |
1. Statement I is correct: Statement II is incorrect
2. Statement I is incorrect: Statement II is correct
3. Statement I is correct: Statement II is correct
4. Statement I is incorrect: Statement II is incorrect
Subtopic: Â Respiratory System: Transport of Gases Part 1 |Â Respiratory System: Transport of Gases Part 2 |Â Respiratory System: Transport of Gases |
 52%
From NCERT
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Carbon dioxide is not carried in the human blood as:
1. dissolved gas
2. bicarbonate ion
3. carbaminohemoglobin
4. carboxyhemoglobin
1. dissolved gas
2. bicarbonate ion
3. carbaminohemoglobin
4. carboxyhemoglobin
Subtopic: Â Respiratory System: Transport of Gases |
 80%
From NCERT
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The oxyhemoglobin dissociation curve is shifted to the right by:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| I: | increased temperature |
| II: | increased pH |
| III: | increased carbon dioxide |
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Â Respiratory System: Transport of Gases |
 68%
From NCERT
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