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OPRA Pharmacology and Toxicology QUESTION #3860
Question 1
Which pharmacological effect would be expected following systemic administration of atropine?
  • Constriction of the pupil
  • Increased gastric motility
  • Micturition
  • Increased heart rate✔️
Correct Answer Explanation
Atropine is a competitive muscarinic antagonist. By blocking parasympathetic (vagal) tone at the sinoatrial node, it removes the brake on heart rate, causing tachycardia (increased heart rate).