(1) Restrictive MEDULLA CAROTID BODY Major causes: Ⅸ NERVE SPINAL CORD CNS and nerves 6 THORACIC CAGE MUSCLE Respiratory muscles chest wall AIRWAYS and pleura Lung( Alveoli) distension I Alveoli distensibility t(1) Restrictive ~ Alveoli distensibility  Major Causes: CNS and nerves Respiratory muscles, chest wall and pleura Lung( Alveoli) distension 