Anaesthesia The severe bronchospasm associated with rapacuronium, the cause is A Allergic reaction B Massive histamine release C Unopposed action M3 muscarinic receptors in the bronchus. D M2 muscarinic receptor activation 💡 Explanation The severe bronchospasm associated with rapacuronium, the cause is ✓ Correct Answer: C. Unopposed action M3 muscarinic receptors in the bronchus.