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Q. No.Regarding haemoglobin and oxygen binding:
I:
Oxygen binds with haemoglobin in an irreversible manner to form oxyhaemoglobin.
II:
Each haemoglobin molecule can carry a maximum of four molecules of O2.
III:
The binding of oxygen with haemoglobin is primarily related to the partial pressure of O2.
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Respiratory System: Transport of Gases |
74%
From NCERT
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Exhalation of air into the lungs can be brought about by:
I: Contraction of diaphragm
II: Contraction of internal intercostal muscles
III: Contraction of external intercostal muscles
1. Only I and II
2. Only II
3. Only I and III
4. Only III
I: Contraction of diaphragm
II: Contraction of internal intercostal muscles
III: Contraction of external intercostal muscles
1. Only I and II
2. Only II
3. Only I and III
4. Only III
Subtopic: Mechanism of Breathing |
From NCERT
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Inhalation of air into the lungs can be brought about by:
1. Only I and II
2. Only II
3. Only I and III
4. Only III
| I: | Contraction of diaphragm |
| II: | Contraction of internal intercostal muscles |
| III: | Contraction of external intercostal muscles |
2. Only II
3. Only I and III
4. Only III
Subtopic: Mechanism of Breathing |
69%
From NCERT
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Functional residual capacity is defined as:
| 1. | Total volume of air a person can inspire after a normal expiration. |
| 2. | Volume of air that will remain in the lungs after a normal expiration. |
| 3. | Total volume of air a person can expire after a normal inspiration. |
| 4. | The maximum volume of air a person can breathe in after a forced expiration |
Subtopic: Respiratory System: Pulmonary Volumes & Capacities |
77%
From NCERT
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What is the partial pressure of carbon dioxide in the alveoli of human lungs?
1. 40 mm Hg
2. 45 mm Hg
3. 95 mm Hg
4. 104 mm Hg
1. 40 mm Hg
2. 45 mm Hg
3. 95 mm Hg
4. 104 mm Hg
Subtopic: Respiratory System: Exchange of Gases |
81%
From NCERT
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During summer sleep and winter sleep in frogs, the gaseous exchange takes place:
1. Across the alveoli in the lungs.
2. Through the moist buccal mucosa.
3. In the gills.
4. Through the skin.
Subtopic: Respiratory Organs |
92%
From NCERT
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Which of the following will be considered as ‘normal’ for a healthy human adult?
| I: | A resting respiratory rate of 12- 16 breaths per minute. |
| II: | A minute ventilation of 6000 – 8000 ml. |
| 1. | Only I is correct | 2. | Only II is correct |
| 3. | Both I and II are correct | 4. | Both I and II are incorrect |
Subtopic: Respiratory System: Pulmonary Volumes & Capacities | Mechanism of Breathing |
85%
From NCERT
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The formation of carbaminohaemoglobin at tissue is primarily related to:
| 1. | pCO2 | 2. | pO2 |
| 3. | H+ ions | 4. | Temperature |
Subtopic: Respiratory System: Transport of Gases |
80%
From NCERT
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The trachea:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | divides into two principal bronchi at the level of 7th thoracic vertebra. |
| II: | is invested by incomplete cartilaginous rings in its wall. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Respiratory System: Trachea & Basic Anatomy of Lung |
80%
From NCERT
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How would the diffusing capacities of carbon dioxide and oxygen across the respiratory membrane compare?
| 1. | The diffusing capacity of oxygen is 20 to 25 times higher than the diffusing capacity of carbon dioxide. |
| 2. | The diffusing capacity of carbon dioxide is 20 to 25 times higher than the diffusing capacity of oxygen. |
| 3. | The diffusing capacity of oxygen is 200 to 250 times higher than the diffusing capacity of carbon dioxide. |
| 4. | The diffusing capacity of carbon dioxide is 200 to 250 times higher than the diffusing capacity of oxygen. |
Subtopic: Respiratory System: Exchange of Gases |
91%
From NCERT
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