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Solution


Q.

Select the correct statement.                     [2019]
1 Expiration occurs due to external intercostal muscles.  
2 Intrapulmonary pressure is lower than the atmospheric pressure during inspiration.  
3 Inspiration occurs when atmospheric pressure is less than intrapulmonary pressure.  
4 Expiration is initiated due to contraction of diaphragm.  

Ans.

(2)