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NBME 23 Answers

nbme23/Block 1/Question#45

A 56-year-old woman comes to the physician because ...

Presynaptic release of acetylcholine

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submitted by step420(26),

Person has Lambert-Eaton syndrome (hx of lung cancer, and muscle activity that is better with use.

Presynaptic Ca2+ antibodies prevent the release of AcH presynaptically because the antibodies prevent the depolarization within the cell and prevents synaptic vessels of ACh from leaving.

thotcandy  ugh, I saw Ca2+ and stopped thinking. +2  
paperbackwriter  @thotcandy Same here :( +