1. Acetylcholine is described as the neurotransmitter secreted by motor nerves to excite skeletal muscles and it is activated by the vagus nerve (the tenth cranial nerve in the medulla that innervates most organs of the abdomen), as well as the nerves that control most internal organs.
乙酰胆碱acetylcholine 被描述为由运动神经分泌的刺激骨骼肌的神经传递介质。它被迷走神经（在骨髓中的第十颅神经，支配多数的体内器官）激活，同时控制多数体内器官。