Massive doses of atropine may be required when:
A) a patient strains to defecate and stimulates muscarinic-2 receptors.
B) acetylcholine increases dramatically due to acetylcholinesterase inhibition.
C) severe bradycardia is the result of a block in the cardiac conduction system.
D) a patient's heart rate significantly increases and lowers the cardiac output.
Ans: B) acetylcholine increases dramatically due to acetylcholinesterase inhibition.
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