A-LevelBiologyImmunity9700/12 · May/June 2020 · Q391 Mark
Myasthenia gravis is a disease that results from the immune system failing to distinguish between self and non-self. Antibodies bind to a component of the junctions between a muscle and its nerve. What correctly describes Myasthenia gravis?
AImpulses in the nerve to the affected muscle cannot be blocked.
BThe affected muscle cannot be repeatedly stimulated.
CThe affected muscle is permanently stimulated.
DThe nerve to the affected muscle does not carry any nerve impulses.
✓ Correct answer
B: The affected muscle cannot be repeatedly stimulated.
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