Which of the following neurotransmitters acts as an excitatory transmitter in the skeletal muscles, but functions as an inhibitory transmitter in the heart muscle?

Question

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Acetylcholine acts as an excitatory transmitter in the skeletal muscles by binding to nicotinic acetylcholine receptors on the motor endplate, leading to muscle contraction. However, in the heart, acetylcholine acts as an inhibitory transmitter by binding to muscarinic acetylcholine receptors on cardiac cells, slowing down the heart rate. Nor- and epinephrine act as excitatory neurotransmitters in both skeletal and cardiac muscles, while serotonin primarily functions as a modulatory neurotransmitter in the CNS.

Which of the Following Neurotransmitters Acts as an Excitatory Transmitter