The mechanism of breathing and the anatomy of the organs that carry out this activity are brought vividly to life through revealing animation and x-ray motion pictures. Additional animation explains how air is cleansed during inhalation and how oxygen is diffused into the bloodstream for use elsewhere in the body. Mouth-to-mouth resuscitation, the Heimlich maneuver and effective treatment for hyperventilation are discussed by a CPR educator. The basic causes and effects of emphysema are also explored. 15 minutes, color.