Question

1. myasthenia gravis is a(n):

hereditary disease characterized by progressive muscle degeneration
autoimmune neuromuscular disorder characterized by severe muscle weakness
spasmodic contraction of the neck muscles
malignant tumor that develops from bone marrow

Explanation:

Myasthenia gravis is an autoimmune neuromuscular disorder. In this condition, the immune system mistakenly attacks the neuromuscular junctions. This leads to problems in the transmission of signals from nerves to muscles. As a result, there is severe muscle weakness. Hereditary disease with progressive muscle degeneration (like muscular dystrophies) has a different pathophysiology. Spasmodic contraction of neck muscles is a different condition (e.g., torticollis). A malignant tumor from bone marrow is a hematological malignancy (like multiple myeloma in some cases) and not related to myasthenia gravis.

Answer:

Autoimmune neuromuscular disorder characterized by severe muscle weakness