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Select the correct sequence of events that occur during expiration.
(i) Relaxation of external intercostal muscles and diaphragm
(ii) Air is expelled from the lungs
(iii) Volume of thorax decreases
(iv) Intra pulmonary pressure increases

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(i), (iii), (iv), (ii)

(ii), (iii), (iv), (i)

(iv), (iii), (ii), (i)

(i), (ii), (iii), (iv)

answer is A.

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Detailed Solution

During expiration,

External intercostal muscles and diaphragm relax
The volume of thorax decreases
The intra pulmonary pressure increases, when there is decrease in volume
Air is expelled from the lungs

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