Acetylcholine has many effects. 1. Promotes glandular secretion, acting on bronchial or salivary glands or sweat glands to increase glandular secretion, such as increased sweating, etc. 2. Acetylcholine, when acting on the eyes, can be used to regulate myopia, causing pupil contraction. 3. Promotes muscle contraction, used to treat patients with myasthenia gravis. 4. 5.It can also weaken the contraction of the heart muscle to slow down the heart rate. 6.Acting on the smooth muscle of the gastrointestinal tract, it can promote gastrointestinal motility and prevent constipation caused by slow gastrointestinal motility.