volume (chest) = __ pressure (intrapulmonary) => exhalation Change chest volume for exhalation. Diaphragm: (contract or relax) Chest shrinks Diaphragm moves (inferior or superior) External intercostals: (contract or relax) Ribs and sternum: (expand or shrinks) Chest volume: (increase or decrease) Intrapulmonary pressure: (increase or decrease) Diaphragm relaxes Air moves => (in or out) 1. When you inhale, your diaphragm moves... a) superior b) inferior c) no change 2. When inhaling, the diaphragm is... a) contracting b) relaxing 3. When you are exhaling, what happens to your rib cage diameter (chest volume)? a) increases b) decreases c) no change 4. As chest volume decrease, the intrapulmonary pressure and you are a) increase, inhaling b) decrease, inhaling c) increase, exhaling d) decrease, exhaling The ribs and sternum expand with the of the intercostal muscles. a) contraction b) relaxation 5.