Why lungs have more negative intrapleural pressure at the apex

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SUMMARY

The discussion centers on the physiological mechanisms behind the negative intrapleural pressure at the apex of the lungs, emphasizing the role of the external intercostal muscles and ribcage dynamics rather than gravity. It is established that during contraction, these muscles elevate the ribcage, which contributes to increased negative pressure in the pleural cavity. Visual aids, such as diagrams, are recommended for better comprehension of these concepts, as textbooks often lack detailed explanations.

PREREQUISITES
  • Understanding of pulmonary ventilation mechanisms
  • Knowledge of human anatomy, particularly the ribcage and intercostal muscles
  • Familiarity with pleural pressure concepts
  • Ability to interpret anatomical diagrams and models
NEXT STEPS
  • Research the mechanics of pulmonary ventilation in detail
  • Study the role of intercostal muscles in respiratory physiology
  • Examine diagrams illustrating lung mechanics and pleural pressure
  • Explore advanced anatomy resources, such as "Gray's Anatomy" for comprehensive insights
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Students of anatomy and physiology, respiratory therapists, and medical professionals seeking a deeper understanding of lung mechanics and intrapleural pressure dynamics.

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in some books it is written that it is because of gravity but i can't understand how gravity can cause such a effect
 
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keep@science said:
in some books it is written that it is because of gravity but i can't understand how gravity can cause such a effect
Can you provide a link that discusses this?
 
Biology textbooks rarely use the term gravity to explain mechanisms and Professors don't always take kindly to students using vocabulary or concepts from other disciplines...

The external intercostal muscles are fixed on the superior end of the ribs, the ribcage is pulled upwards upon contraction, which increases negative pressure. Looking at a diagram may help you understand (or take A & P I). It is difficult to understand functions in the body without visual models to show relations, it certainly isn't something you can easily get by only reading text.
 
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