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Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because

Q1

Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because

athere is a negative pressure in the lungs

bthere is a negative intrapleural pressure pulling at the lung walls

cthere is a positive intrapleural pressure

dpressure in the lungs is higher than the atmospheric pressure.

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