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______________ is a methylxanthine used in the treatment of asthma to relax the smooth muscle of the bronchial airways and pulmonary blood vessels.

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User Malenko
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Final answer:

Theophylline is a methylxanthine used in the treatment of asthma to relax the smooth muscle of the bronchial airways and pulmonary blood vessels.

Step-by-step explanation:

The methylxanthine used in the treatment of asthma to relax the smooth muscle of the bronchial airways and pulmonary blood vessels is theophylline.

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User General Waters
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