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NEET Exam Model Paper 5

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Question : 50

Total: 180

Even after forceful expiration, lungs are not emptied and residual volume of air remains the lungs because

Intrapleural pressure is always lesser than alveolar pressure
Alveolar pressure is never more than atmospheric pressure
Intrapleural pressure is always greater than alveolar pressure
Surfactant in the alveolar fluid increases the surface tension

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