In obedience to a long-established habit, the Wellands had left the previous week for St. Augustine, where, out of regard for the supposed susceptibility of Mr. Welland’s bronchial tubes, they always spent the latter part of the winter.
There are no more uses of "bronchial tubes" in the book.
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It makes him start to hyperventilate, which makes his bronchial tubes begin to constrict.
Neal Shusterman -- Unwind
The director of CERN, Maximilian Kohler, opened his eyes to the cool rush of cromolyn and leukotriene in his body, dilating his bronchial tubes and pulmonary capillaries.