Muscle tissues have receptors called Acetylcholine receptors (AChR), that bind to neurotransmitter Acetylcholine. This enables control over muscles, particularly voluntary muscles. Myasthenia Gravis (MG) is an autoimmune disorder where the immune system produces AChR antibodies. These antibodies prevent Acetylcholine from binding to the receptors on the muscles. As a result, the patient is unable to exercise control over his muscles. Symptoms include droopy eyelid, double vision, chewing difficulty and muscle weakness. A blood test is done to look for presence of these antibodies in the blood stream of a patient with MG symptoms.