Myasthenia gravis is an autoimmune disease affecting the:
A. Myelin of peripheral nerves.
B. ACh receptors at the neuromuscular junction.
C. Release of ACh from the presynaptic terminal.
D. Storage of calcium in the sarcoplasmic reticulum.
E. Alpha motor neurons in the ventral horn of spinal cord.
ANS: B
Rationale: Myasthenia gravis is an autoimmune disease that damages ACh receptors on the muscle membrane.
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