Assertion (A): The anatomical setup of lungs in thorax is such that any change in the volume of the thoracic cavity will be reflected in the lungs cavity.
Reason (R): The thoracic chamber is formed dorsally by the vertebral column, ventrally by sternum, laterally by the ribs and on the lower side by diaphragm.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Respiratory System: Trachea & Basic Anatomy of Lung | Respiratory System: Pulmonary Ventilation |
58%
From NCERT
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Identify the correct descending order [begin with maximum value] of the partial pressure of oxygen at different parts involved in diffusion in comparison to those in the atmosphere:
| 1. | Atmosphere – Alveoli – Oxygenated blood – Tissues |
| 2. | Alveoli - Atmosphere – Oxygenated blood – Tissues |
| 3. | Atmosphere – Oxygenated blood – Alveoli – Tissues |
| 4. | Tissues – Alveoli – Deoxygenated blood – Oxygenated blood |
Subtopic: Respiratory System: Exchange of Gases |
87%
From NCERT
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Match the pulmonary volume/capacity given in Column I with the corresponding description in Column II and select the correct match from the codes given:
Codes:
| Column I | Column II | ||
| A | Expiratory reserve volume | P | Additional volume of air, a person can inspire by a forcible inspiration. |
| B | Inspiratory reserve volume | Q | Additional volume of air, a person can expire by a forcible expiration. |
| C | Residual volume | R | Volume of air that will remain in the lungs after a normal expiration. |
| D | Functional residual capacity | S | Volume of air remaining in the lungs even after a forcible expiration. |
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | P | Q | S | R |
| 3. | Q | P | R | S |
| 4. | Q | P | S | R |
Subtopic: Respiratory System: Pulmonary Volumes & Capacities |
69%
From NCERT
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What is the maximum number of oxygen molecules that a molecule of haemoglobin can carry?
| 1. | 2 | 2. | 4 |
| 3. | 6 | 4. | 8 |
Subtopic: Respiratory System: Transport of Gases |
94%
From NCERT
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The maximum volume of air a person can breathe out after a forced inspiration is called as:
1. Functional residual capacity
2. Vital capacity
3. Expiratory reserve volume
4. Residual volume
1. Functional residual capacity
2. Vital capacity
3. Expiratory reserve volume
4. Residual volume
Subtopic: Respiratory System: Pulmonary Volumes & Capacities |
69%
From NCERT
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Inflammation of bronchi and bronchioles leading to difficulty in breathing is characteristically seen in:
1. Bronchial asthma
2. Emphysema
3. Tuberculosis
4. Pneumonia
1. Bronchial asthma
2. Emphysema
3. Tuberculosis
4. Pneumonia
Subtopic: Respiratory Disorders: Part 1 | Respiratory Disorders: Part 2 | Respiratory Disorders - III |
86%
From NCERT
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Consider the given two statements:
| Assertion (A): | The amount of CO2 that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher compared to that of O2. |
| Reason (R): | Haemoglobin does not play any role in the transport of carbon dioxide in human blood. |
| 1. | (A) is True but (R) is False |
| 2. | Both (A) and (R) are True and (R) correctly explains (A) |
| 3. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 4. | (A) is False but (R) is True |
Subtopic: Respiratory System: Exchange of Gases |
86%
From NCERT
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Contraction of diaphragm:
| 1. | increases the diameter of thorax in dorso-ventral axis and brings about inhalation |
| 2. | decreases the diameter of thorax in dorso-ventral axis and brings about exhalation |
| 3. | increases the diameter of thorax in antero-posterior axis and brings about inhalation |
| 4. | decreases the diameter of thorax in antero-posterior axis and brings about exhalation |
Subtopic: Respiratory System: Pulmonary Ventilation |
80%
From NCERT
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Favourable conditions for the oxygenation of haemoglobin at alveoli include all the following except:
1. High pO2
2. Low pCO2
3. Low pH
4. Low temperature
Subtopic: Respiratory System: Transport of Gases |
81%
From NCERT
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Consider the two statements:
1. Statement I is correct; Statement II is incorrect
2. Statement I is correct; Statement II is correct
3. Statement I is incorrect; Statement II is incorrect
4. Statement I is incorrect; Statement II is correct
| Statement I: | Humans breathe by negative pressure. |
| Statement II: | The respiratory center is directly affected by low oxygen levels. |
2. Statement I is correct; Statement II is correct
3. Statement I is incorrect; Statement II is incorrect
4. Statement I is incorrect; Statement II is correct
Subtopic: Respiratory System: Pulmonary Ventilation |
68%
From NCERT
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