5. Lung Compliance-1 | Static vs Dynamic | Obstructive vs Restrictive lung diseases (1st Year MBBS)
Channel: Cool Concepts in Physiology, Anatomy (& Life)
Date: 2021-06-22

Compliance is the extent to which lungs expand for each unit change in transpulmonary pressure (Ptp). Mathematically, it is denoted as C=dV/dP. 
Compliance of Lungs only: 200 ml/cm H2O Ptp 
Compliance of combined lung-thorax system: 110 ml/cm H2O Ptp

Re-expanding a Cadaver or Collapsed lung 
1. Initially pressure is required to ‘regain’ original lung & chest wall volume (static compliance)
Once lung is expanded…

2. In vivo, over and above ‘static compliance’, pressure is required to overcome:
Inertia of air molecules 
Resistance of tissues (airways)* 
(Dynamic compliance)

#1stYear #MBBS #Compliance01

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