- 1(current)
Q. No.It is necessary that lungs must be present in anatomically air-tight chamber because:
| 1. | we cannot directly alter the pulmonary volume |
| 2. | our lungs are not made of any elastic tissue |
| 3. | the pleural cavity always has a positive pressure with respect to pulmonary pressure |
| 4. | the partial pressure of oxygen in atmosphere is less than that in the alveoli |
Subtopic: Â Respiratory System: Pulmonary Ventilation |
 76%
Level 2: 60%+
Hints
During expiration, the diaphragm and external intercostal muscles are:
| 1. | contracted |
| 2. | relaxed |
| 3. | flexed |
| 4. | both relaxed (diaphragm) and flexed (intercostal muscles) |
Subtopic: Â Respiratory System: Pulmonary Ventilation |
 77%
Level 2: 60%+
Hints
When the diaphragm or external intercostal muscles contract, intrapulmonary pressure should
| 1. | increase | 2. | decrease |
| 3. | remain constant | 4. | equal atmospheric pressure |
Subtopic: Â Respiratory System: Pulmonary Ventilation |
 80%
Level 1: 80%+
Hints
The volume of thoracic chamber in the antero-posterior axis can be increased by:
| 1. | Contraction of diaphragm |
| 2. | Relaxation of diaphragm |
| 3. | Contraction of external intercostals |
| 4. | Contraction of internal intercostals |
Subtopic: Â Respiratory System: Pulmonary Ventilation |
 80%
Level 1: 80%+
Hints
- 1(current)
Q. No.
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