The endorphins are released immediately following ____________
 |
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the rapid influx of calcium ions along the postsynaptic membrane; |
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the rapid influx of calcium ions along the presynaptic membrane; |
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the slow influx of calcium ions along the postsynaptic membrane; |
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the slow rise of calcium ions within the presynaptic cytoplasm; |
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both c and d are correct alternatives; |
[Review Part 1 of the tutorial]
[Review Part 2 (Matching) of the tutorial]