Bronchospasm can be precipitated by______________?
Correct answer: B. propranolol
- A. Adrenaline
- B. propranolol
- C. Atropine
- D. Salbutamol
Explanation
Propranolol blocks beta2 receptors in bronchial smooth muscle, removing bronchodilator sympathetic influence and potentially producing severe bronchospasm. Salbutamol has the opposite effect because it stimulates beta2 receptors.
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