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Question
Distinguish between inspiration and expiration.
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Solution
| No. | Inspiration | Expiration |
| i. | Atmospheric air is taken into the lungs. | Air rushes out from the lungs. |
| ii. | It is an active process. | It is a passive process. |
| iii. | Contraction of external intercostal muscles occurs. | Relaxation of external intercostal muscles occurs. |
| iv. | Diaphragm contracts and becomes flattened. | Diaphragm relaxes and becomes original dome shaped. |
| v. | Increase in volume of thoracic cavity. | Decrease in volume of thoracic cavity. |
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