Pelvic Pain Slideshow Birth Control Slideshow Pictures Take the Happiness Quiz! Acetylcholine: A neurotransmitter released by nerves that is essential for communication between the nerves and muscles. From Women's Health Resources Tips for Taking Your HIV Medicines5 Things That Spike Your Blood SugarComplementary Treatments for Cancer Featured Centers When Prostate Cancer SpreadsEssential Tips to Manage DiabetesWhat Is Cystic Fibrosis? What Causes It? Health Solutions From Our Sponsors Kept Your Wisdom Teeth? Therapy at Home?