乙酰胆碱的合成和代谢 Choline COOH 1 decarboxylase NH2 N-methyltransferase H Choline N Receptor N+ H i acetyltransferase E AChE Acetylcholine 1.丝氨酸脱羧酶;2.胆碱N甲基转移酶;3.胆碱乙酰基转移酶乙酰胆碱的合成和代谢 Choline acetyltransferase Serine decarboxylase Choline N-methyltransferase HO N+ HO HO NH2 COOH NH2 Acetylcholine O O N+ 1 2 3 1. 丝氨酸脱羧酶； 2. 胆碱N-甲基转移酶； 3. 胆碱乙酰基转移酶 AChE Receptor E