Deryl Gulliford (left), RRT, MHA, JD respiratory care instructor at Autry Technology Center, tells one of his students to pant like a dog as Gulliford demonstrates the proper use of a MedGraphics Elite Series Plethysmograph that measures lung volume Wednesday, Feb. 11, 2015. The specialized medical equipment was recently donated to Autry Technology's program by Stillwater Medical Center. (Staff Photo by BONNIE VCULEK)

Deryl GullifordRRTMHAJDRespiratory CareAutry Technology CenterPlethysmographStillwater Medical CenterBonnie VculekEnid