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Q.

Mark the incorrect difference between inspiration and expiration.

 InspirationExpiration
1.Atmospheric air is drawn inAlveolar air is released out
2.Thoracic volume increasesThoracic volume decreases
3.Diaphragm flattensDiaphragm becomes dome-shaped
4.Internal intercostal muscles contractExternal intercostal muscles contract

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a

1

b

2

c

3

d

4

answer is D.

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Detailed Solution

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External intercostal muscles contract during inspiration. Internal intercostal muscles contract during forceful expiration. Normal expiration occurs by the relaxation of external intercostal muscles and the diaphragm.

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Mark the incorrect difference between inspiration and expiration. InspirationExpiration1.Atmospheric air is drawn inAlveolar air is released out2.Thoracic volume increasesThoracic volume decreases3.Diaphragm flattensDiaphragm becomes dome-shaped4.Internal intercostal muscles contractExternal intercostal muscles contract