Final answer:
Myasthenia gravis is a genetic neuromuscular disorder characterized by progressive muscle weakness due to blocked acetylcholine receptors on muscle cells.
Step-by-step explanation:
Myasthenia gravis is a genetic neuromuscular disorder that affects the acetylcholine receptors on muscle cells, causing progressive muscle weakness. In this disorder, the immune system blocks the acetylcholine receptors at the neuromuscular junction, preventing normal muscle contraction capability. As a result, muscles become increasingly weakened and fatigued over time.