Joe has the hiccups. The hiccups are periodic spastic contractions of the diaphragm. The diaphragm suddenly (briefly, but forcefully) contracts during a hiccup. Explain what happens to each of the following pressures and volumes, and how they relate to each other during that brief, forceful hiccup contraction. Be sure to clearly state if each volume or pressure increased, decreased, or did not change and briefly explain. Also be sure to state whether air is moving into or out of the airways and lungs as the hiccup Occurs. 1. Thoracic volume 2. Intrapleural pressure (Pip) 3. Transpulmonary pressure (PTP) 4. Alveolar (lung) volume 5. Alveolar pressure (Palv) 6. Does air move into or out of the lungs as the hiccup occurs?

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