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Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because [NEET 2016 Phase 2]
- a)There is a negative pressure in the lungs
- b)There is a negative intrapleural pressure pulling at the lung walls
- c)There is a positive intrapleural pressure
- d)Pressure in the lungs is higher than the atmospheric pressure.
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Lungs do not collapse between breaths and some air always remains in t...
Intrapleural pressure is the pressure of air within the pleural cavity. Intrapleural pressure is always negative, which acts like a suction to keep the lungs inflated and prevent them from collapsing. The negative intrapleural pressure is due to three main factors: surface tension of the alveolar fluid; elasticity of lungs; elasticity of thoracic wall. Normally, there is a difference between intrapleural and intrapulmonary pressure, which is called transpulmonary pressure. This transpulmonary pressure creates the suction to keep the lungs inflated. If there is no pressure difference, there is no suction and lungs will collapse.
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Lungs do not collapse between breaths and some air always remains in t...
Understanding Lung Mechanics
The lungs remain inflated and do not collapse between breaths due to a combination of anatomical and physiological factors. The key reason is related to intrapleural pressure.
Intrapleural Pressure Dynamics
- The space between the lungs and the chest wall is called the pleural cavity.
- This cavity contains a thin layer of pleural fluid and is crucial for lung function.
- The pressure within this pleural cavity is always negative compared to the atmospheric pressure.
Why Negative Pressure is Essential
- The negative intrapleural pressure creates a suction effect.
- This suction pulls the lungs outward, preventing them from collapsing.
- Even during exhalation, when the lungs are at their smallest volume, some air remains trapped (residual volume) due to this negative pressure.
Implications of Intrapleural Pressure
- If the intrapleural pressure were to equal atmospheric pressure (as seen in a pneumothorax), the lungs would collapse.
- The lungs are designed to maintain this negative pressure to ensure they remain inflated and functional.
Conclusion
- The constant negative intrapleural pressure is the primary reason why the lungs do not collapse and always retain some air.
- This mechanism is crucial for efficient gas exchange and overall respiratory function.
The lungs remain inflated and do not collapse between breaths due to a combination of anatomical and physiological factors. The key reason is related to intrapleural pressure.
Intrapleural Pressure Dynamics
- The space between the lungs and the chest wall is called the pleural cavity.
- This cavity contains a thin layer of pleural fluid and is crucial for lung function.
- The pressure within this pleural cavity is always negative compared to the atmospheric pressure.
Why Negative Pressure is Essential
- The negative intrapleural pressure creates a suction effect.
- This suction pulls the lungs outward, preventing them from collapsing.
- Even during exhalation, when the lungs are at their smallest volume, some air remains trapped (residual volume) due to this negative pressure.
Implications of Intrapleural Pressure
- If the intrapleural pressure were to equal atmospheric pressure (as seen in a pneumothorax), the lungs would collapse.
- The lungs are designed to maintain this negative pressure to ensure they remain inflated and functional.
Conclusion
- The constant negative intrapleural pressure is the primary reason why the lungs do not collapse and always retain some air.
- This mechanism is crucial for efficient gas exchange and overall respiratory function.
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Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because [NEET 2016 Phase 2]a)There is a negative pressure in the lungsb)There is a negative intrapleural pressure pulling at the lung wallsc)There is a positive intrapleural pressured)Pressure in the lungs is higher than the atmospheric pressure.Correct answer is option 'B'. Can you explain this answer? for NEET 2026 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because [NEET 2016 Phase 2]a)There is a negative pressure in the lungsb)There is a negative intrapleural pressure pulling at the lung wallsc)There is a positive intrapleural pressured)Pressure in the lungs is higher than the atmospheric pressure.Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because [NEET 2016 Phase 2]a)There is a negative pressure in the lungsb)There is a negative intrapleural pressure pulling at the lung wallsc)There is a positive intrapleural pressured)Pressure in the lungs is higher than the atmospheric pressure.Correct answer is option 'B'. Can you explain this answer?.
Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because [NEET 2016 Phase 2]a)There is a negative pressure in the lungsb)There is a negative intrapleural pressure pulling at the lung wallsc)There is a positive intrapleural pressured)Pressure in the lungs is higher than the atmospheric pressure.Correct answer is option 'B'. Can you explain this answer? for NEET 2026 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because [NEET 2016 Phase 2]a)There is a negative pressure in the lungsb)There is a negative intrapleural pressure pulling at the lung wallsc)There is a positive intrapleural pressured)Pressure in the lungs is higher than the atmospheric pressure.Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because [NEET 2016 Phase 2]a)There is a negative pressure in the lungsb)There is a negative intrapleural pressure pulling at the lung wallsc)There is a positive intrapleural pressured)Pressure in the lungs is higher than the atmospheric pressure.Correct answer is option 'B'. Can you explain this answer?.
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