Which one is excitatory neurotransmitter?: (A) Acetylcholine, (B) Histamine, (C) Melatonin, (D) GABA
Answer is A. acetylcholine serves excitatory and inhibitory functions, which means that ACh can speed up or slow down nerve signals. In the central nervous system, its function is mainly excitatory Ref : guyton and hall textbook of medical physiology 12 edition page number:677,678,679