Q. No.Which of the following events happen when air is expelled from the lungs
| 1. | Ribs and sternum return to the original position |
| 2. | volume of thorax decreases |
| 3. | Diaphragm relaxes and arches upwards |
| 4. | All of the above |
Subtopic: Â Respiratory System: Pulmonary Ventilation |
 97%
Level 1: 80%+
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Which of the following events happen when air enters lungs
| 1. | Ribs and sternum raised |
| 2. | volume of thorax increased |
| 3. | Diaphragm contracted |
| 4. | All of the above |
Subtopic: Â Respiratory System: Pulmonary Ventilation |
 98%
Level 1: 80%+
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Which of the following is true for inspiration
| 1. | thoracic chamber volume increases |
| 2. | Diaphragm contracts |
| 3. | pulmonary volume increases |
| 4. | All of these |
Subtopic: Â Respiratory System: Pulmonary Ventilation |
 97%
Level 1: 80%+
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Inspiration during breathing occurs when the pressure in lungs is:
| 1. | Zero |
| 2. | Negative with respect to atmospheric pressure |
| 3. | Equal to atmospheric pressure |
| 4. | Positive with respect to atmospheric pressure |
Subtopic: Â Respiratory System: Pulmonary Ventilation |
 91%
Level 1: 80%+
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Pressure gradient between the lungs and atmosphere is maintained by
| 1. | diaphragm |
| 2. | external intercostal muscles |
| 3. | internal intercostal muscles |
| 4. | All of these |
Subtopic: Â Respiratory System: Pulmonary Ventilation |
 95%
Level 1: 80%+
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On an average, a healthy human breathes
| 1. | 12-16 times/min | 2. | 70-80 times/min |
| 3. | 80-120 times/min | 4. | 3-5 times/min |
Subtopic: Â Respiratory System: Pulmonary Ventilation |
 90%
Level 1: 80%+
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The external intercostal muscles and the diaphragm contract:
| 1. | during inhalation |
| 2. | during exhalation |
| 3. | during both inhalation and exhalation |
| 4. | during neither inhalation nor exhalation. |
Subtopic: Â Respiratory System: Pulmonary Ventilation |
 86%
Level 1: 80%+
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Select the correct statement.
| 1. | Expiration occurs due to external intercostal muscles. |
| 2. | Intrapulmonary pressure is lower than the atmospheric pressure during inspiration. |
| 3. | Inspiration occurs when atmospheric pressure is less than intrapulmonary pressure. |
| 4. | Expiration is initiated due to contraction of diaphragm. |
Subtopic: Â Respiratory System: Pulmonary Ventilation |
 84%
Level 1: 80%+
NEET - 2019
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During expiration which of the following events takes place
| 1. | Diaphragm and external intercostal muscles contracts |
| 2. | Diaphragm and external intercostal muscles relax |
| 3. | Inter Pleural pressure is less than atmospheric pressure |
| 4. | Both A and C |
Subtopic: Â Respiratory System: Pulmonary Ventilation |
 81%
Level 1: 80%+
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The volume of thoracic chamber can be increased by:
| 1. | Contraction of diaphragm and external intercostals |
| 2. | Contraction of diaphragm and internal intercostals |
| 3. | Relaxation of diaphragm and contraction of external intercostals |
| 4. | Relaxation of diaphragm and contraction of internal intercostals |
Subtopic: Â Respiratory System: Pulmonary Ventilation |
 77%
Level 2: 60%+
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