Abstract
The major resistance airways of human subjects are innervated by at least three different types of autonomic nerves. The specific physiologic “ advantage” to this homeostatic system for regulation of bronchomotor tone is uncertain; however, some degree of bronchomotor tone results from parasympathetic innervation in all normal individuals. Asthma differs from the normal bronchoconstrictor response in both the severity of bronchoconstriction and by the apparent failure of normal homeostatic dilator systems to reverse the constrictor response.
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