When the inspiratory neurons of the ventral respiratory group of the medullary respiratory centers are activated, impulses travel by the nerve and the nerve to stmulate the contraction of the diaphragm and the external intercostal muscles respectively a. phrenic, costal Obphrenic, intercostal O c. vagus; costal d.vagus, intercostal 2.5 points QUESTION 2 26. The principal cells of the collecting duct are responsible for: O a maintain the body’s water and sodium balance Ob maintaining the acid-base balance of the blood O c both of the above O d. none of the above 6. For inspiration to occur O a. the lung must expand which decreases lung volume and increases pressure in the lung Ob the lung must expand which increases lung volume and increases pressure in the lung O c. the lung must expand which decreases lung volume and does not affect the pressure in the lung Od the lung must expand which increases lung volume and decreases pressure in the lung

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