Which of the following conditions is characterized by varying degrees of weakness of the skeletal muscles and is considered to be a chronic, autoimmune disease?

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Myasthenia gravis is a chronic autoimmune disease characterized by varying degrees of weakness of the skeletal muscles. The disease is caused by a breakdown in the normal communication between nerves and muscles, leading to symptoms such as drooping eyelids, difficulty speaking and swallowing, and weakness in the arms and legs. Muscular dystrophy is also a condition characterized by muscle weakness, but it is genetic in nature. Rhabdomyolysis is a condition where muscle fibers break down and release their contents into the bloodstream, which can cause kidney damage. Rheumatism and Polymyalgia rheumatica are both conditions that cause joint pain and stiffness, but they do not involve muscle weakness.

Which of the Following Conditions Is Characterized by Varying Degrees