When acetylcholine binds to muscarinic receptors it: 

• Facilitates the contraction of muscles that control near vision
• Regulates heart contractions and lowers heart rate
• Regulates blood pressure
• Causes various glands to secretes substances such as milk, saliva, digestive juices, tears, and sweat
• Increases stomach and intestine secretions and contracts intestinal muscles, which facilitates the movement of food through the intestine 
• Causes an erection
• Controls the release of urine
• Muscarinic receptors play a role in long-term and working memory as well as memory formation, retrieval, and consolidation.