What are the functions of acetylcholine?

Overall, acetylcholine plays a key role in:

• Voluntary muscle movement in the body
• The autonomic nervous system, which supports proper functioning of the internal organs 
• Brain nerve cells and processes such as short and long term memory, memory formation and retrieval, thinking, and learning
• Motivation, attention, and learning
• Arousal
• Regulating heart contractions and decreasing heart rate
• Regulates blood pressure
• Contracting muscles that control near vision
• Enabling contraction of the skeletal muscle
• Contracting intestinal muscles to move food through the intestine
• Facilitating glandular secretions including saliva, sweat, tears, and digestive juices 
• Promoting rapid eye movement (REM) sleep
• Facilitating the release of adrenaline and norepinephrine from the adrenal glands 
• Controlling the release of urine