understanding asthma has been completely updated for the 2nd edition. the chart defines asthma and discusses possible causes and how it is diagnosed. the chart illustrates and describes what happens during an asthma attack with side by side images of an affected bronchiole and a healthy bronchiole also illustrates and describes how the lungs work includes a microscopic view of an alveolar sac a "monitoring your asthma by zone" chart matches various degrees of asthma symptoms with appropriate actions symptoms for adults and children are listed also included are common triggers and information on monitoring and managing asthma. laminated and paper versions are available in english and spanish. made in usa available in the following versions: 20" x 26" heavy weight paper laminated with grommets at top corners isbn 9781587799389 20" x 26" heavy weight paper isbn 9781587799372 20" x 26" heavy weight paper laminated with grommets at top corners spanish isbn 9781587799440 20" x 26" heavy weight paper spanish isbn 9781587799433