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5 / 20  For a neuron to fire an action potential, its membrane must reach ________.
A  hyperpolarization
B  the threshold of excitation
C  the refractory period
D  inhibitory postsynaptic potential

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Source:  OpenStax, Human biology. OpenStax CNX. Dec 01, 2015 Download for free at http://legacy.cnx.org/content/col11903/1.3
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