<prompt> Which of the following is increased in elderly patients compared with their younger counterpasVital capacityVentilatory response to hypoxia or hypercarbiaAir trappingResting aerial oxygen tension PaO2  <response>: The propensity for air trapping is increased with age. In contrast, the vital capacity A, aerial oxygen tension C, and ventilatory response to hypoxia or hypocarbia are decreased with age. 