Respiratory System: Trachea & Basic Anatomy of Lung Past Year (2016 - 2018) MCQs Breathing and Exchange of Gases Zoology NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

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

1.	there is a negative pressure in the lungs
2.	there is a negative intrapleural pressure pulling at the lung walls
3.	there is a positive intrapleural pressure
4.	pressure in the lungs is higher than the atmospheric pressure

Subtopic: Respiratory System: Trachea & Basic Anatomy of Lung |

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