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Multiple Choice: Chapter 2 The thoracic cage and respiratory muscles Question 2.1. Intercostal spaces a contain an intercostal nerve, intercostal vein and intercostal artery lying just above the top of the rib b contain the main expiratory muscles c are stiffened during inspiration and expiration by the contraction of the intercostal muscles d contain muscles which are too weak to maintain adequate resting ventilation if the diaphragm is paralyzed.