Which of the following sympathominetic agents is the most bronchodilator_____________?
Correct answer: C. Isoproterenol
- A. Amphetamine
- B. Nor epinephrine
- C. Isoproterenol
- D. Phenylephrine
Explanation
Isoproterenol stimulates β2 receptors strongly and directly relaxes bronchial smooth muscle, producing marked bronchodilation. Norepinephrine and phenylephrine are predominantly α agonists, while amphetamine has little direct bronchodilator action.
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