<prompt> Anatomic dead space in a non smoker under normal conditions is:2.2 cckg5.1 cckg3.1 cckg1.5 cckg  <response>: Approximately 30 of each breath does not paicipate in alveolar gas exchange and is thus called dead space ventilation VDS. Dead space ventilation is made up of anatomic dead space and alveolar dead space. Anatomic dead space is the volume of air that fills the conducting airways trachea, bronchi, and bronchioles and is estimated at approximately 2.2 cckg. The combination of alveolar and anatomic dead space is called the physiologic dead space. Ref: Slesinger T.L. 2011. Chapter 20. Blood Gases. In R.K. Cydulka, G.D. Meckler Eds, Tintinallis Emergency Medicine: A Comprehensive Study Guide, 7e. 