- 1(current)
Q. No.Consider the given two statements:
| Assertion (A): | Inspiration can occur if there is a negative pressure in the lungs with respect to atmospheric pressure. |
| Reason (R): | The thoracic chamber is an airtight chamber. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 3. | (A) is True, (R) is False |
| 4. | (A) is False, (R) is True |
Subtopic: Mechanism of Breathing |
80%
From NCERT
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Consider the given two statements:
| Assertion (A): | Relaxation of the diaphragm and the inter-costal muscles brings about inspiration. |
| Reason (R): | Relaxation of the diaphragm and the inter-costal muscles leads to an increase in intra-pulmonary pressure to slightly above the atmospheric pressure. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 3. | (A) is True but (R) is False |
| 4. | (A) is False but (R) is True |
Subtopic: Mechanism of Breathing |
83%
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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During inhalation, the diaphragm contracts and flattens. What is the direct consequence of this action on the volume of the thoracic cavity?
1. It decreases
2. It fluctuates
3. It remains unchanged
4. It increases
1. It decreases
2. It fluctuates
3. It remains unchanged
4. It increases
Subtopic: Mechanism of Breathing |
91%
From NCERT
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The contraction of external intercostal muscles:
1. elevates the rib cage and brings about exhalation.
2. elevates the rib cage and brings about inhalation.
3. depresses the rib cage and brings about exhalation.
4. depresses the rib cage and brings about inhalation.
1. elevates the rib cage and brings about exhalation.
2. elevates the rib cage and brings about inhalation.
3. depresses the rib cage and brings about exhalation.
4. depresses the rib cage and brings about inhalation.
Subtopic: Mechanism of Breathing |
87%
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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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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- 1(current)
Q. No.
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