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Multiple Choice: Chapter 6 Lung mechanics: elastic forces Question 6.1. When producing a pressure-volume loop for the measurement of static lung compliance a intrapleural pressure is usually assessed using a cannula passed between the ribs into the intrapleural space b lung compliance is calculated as volume/intrapleural pressure at functional residual capacity c the pressure-volume relationship is the same during inspiration and expiration d measurements of volume and intrapleural pressure are taken as the subject holds his breath because then alveolar pressure is zero.