This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System Pa 1, Subject name: Physiology
Total lung capacity depends upon:- 
Select and explain. 
A. Size of airway, B. Closing volume, C. Lung compliance, D. Residual volume
C: Lung compliance
Answer: C: Lung compliance 
Explanation: TLC is the maximum volume to which the lungs can be expanded with the greatest possible effo. TLC = VC + RV (VC = IRV + TV + ERV) The expansion of lungs depends on its compliance Def: the extent to which lungs will expand for each unit increase in Transpulmonary pressure is k/a lung compliance.