Question

The disease known as myasthenia gravis produces an unusually rapid onset of fatigue and weakness in certain muscle groups due to ________.

1) Autoantibodies attacking the neuromuscular junction
2) High levels of acetylcholine
3) Nerve damage
4) D. Decreased muscle fiber size

Answer 1

Myasthenia gravis is an autoimmune disease that produces muscle weakness and fatigue due to autoantibodies attacking the acetylcholine receptors at the neuromuscular junction.

Step-by-step explanation:

Myasthenia gravis is an autoimmune disease that occurs when the body produces autoantibodies that attack the neuromuscular junction, specifically the acetylcholine receptors. These autoantibodies prevent acetylcholine from binding to the receptors, which disrupts nerve signal transmission to the muscle cells. As a result, muscle weakness and fatigue occur, leading to rapid onset of fatigue and weakness in certain muscle groups.