Fig. 6
From: The role of heterogeneity in asthma: a structure-to-function perspective
(reproduced with permission from [27])
A model airway tree for an asthmatic subjects following bronchoconstriction with methacholine (left) and following bronchodilation with albuterol (right). Open ventilated airways are depicted in black with closed nonventilated airways depicted in red. Note that following bronchodilation, most, but not all, of the airways recover