Human lungs - class-XI

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Question 1 of 45

Which of the following changes occur in diaphragm and intercostal muscles when expiration of air takes place?

Select Your Answer:

Internal intercostal muscles relax and diaphragm contracts

External intercostal muscles and diaphragm relaxes

Internal intercostal muscles contract and diaphragm relax

External intercostal muscles and diaphragm contract

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