Hypersensitivity and Autoimmunity · USMLE Step 1

A patient with myasthenia gravis produces antibodies that block acetylcholine receptors. Which hypersensitivity classification fits this?

  1. Type I
  2. Type II
  3. Type III
  4. Type IV
Show answer and explanation

Correct answer: Type II

Myasthenia gravis is a Type II hypersensitivity mediated by receptor-blocking antibodies. The result is impaired neuromuscular transmission.

Difficulty: Medium Question 9 of 20

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