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Question : Negative pressure inside lungs is created due to

Answer»

The contraction of muscles of diaphragm & relaxation of EXTERNAL INTERCOSTAL muscles
The relaxation of muscles of diaphragm & contraction of external intercostal muscles
The contraction of muscles of diaphragm & contraction of external intercostal muscles
The relaxation of muscles of diaphragm & relaxation of external intercostal muscles

Answer :C


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