Lungs are made up of air-filled sacs the alveoli. They do not collaps – McqOptions

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1.	Lungs are made up of air-filled sacs the alveoli. They do not collapse even after forceful expiration, because of :
A.	Residual Volume
B.	Inspiratory Reserve Volume
C.	Tidal Volume
D.	Expiratory Reserve Volume
Answer» B. Inspiratory Reserve Volume

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