The muscle weakness of myasthenia gravis results from
A) insufficient acetylcholine release from presynaptic vesicles.
B) loss of acetylcholine receptors in the end-plate membrane.
C) the motor neuron action potential being too small to shock the muscle fibers.
D) excessive acetylcholinesterase that destroys the neurotransmitter.
E) All of the answers probably contribute to the muscle weakness.
Answer: B
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