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

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

Solution & Step-by-step Explanation

The negative intrapleural pressure (pressure between the pleural membranes) acts like a vacuum, keeping the lungs inflated against the thoracic wall. This prevents the lungs from completely collapsing and ensures a Residual Volume remains.

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Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because:
A
pressure in the lungs is higher than the atmospheric pressure
B
there is a negative pressure in the lungs
C
there is a negative intrapleural pressure pulling at the lung walls
D
there is a positive intrapleural pressure

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