Which of the following agents can be used to counter the effects of acetylcholine?Group of answer choicesSuxamethoniumAtropineNeostigmineAtenolol

To determine which agent can be used to counter the effects of acetylcholine, let's analyze the options provided:

1. Suxamethonium: This is a depolarizing neuromuscular blocker that acts by mimicking acetylcholine at the neuromuscular junction, leading to paralysis rather than countering acetylcholine.

2. Atropine: This is an anticholinergic agent that blocks the action of acetylcholine at muscarinic receptors. It can effectively counteract some of the effects of acetylcholine, particularly in the context of bradycardia (slow heart rate) and secretions.

3. Neostigmine: This is an acetylcholinesterase inhibitor, meaning it prevents the breakdown of acetylcholine, thereby increasing its action rather than countering it.

4. Atenolol: This is a beta-blocker that primarily affects adrenergic receptors and is not directly involved in countering acetylcholine.

Final Answer

Atropine is the agent that can be used to counter the effects of acetylcholine.