1) Neuron is at rest a) a stimulus occurs b) voltage-gated sodium ion channels open c) allow potassium ions to leave the neuron d) sodium ions enter the neuron e) neuron positive charge is increased on the inside f) membrane potential remains unchanged 2) Threshold stage a) repolarization occurs b) action potential is fired c) closes all sodium ion channels d) more sodium ion channels are open e) depolarization begins f) neuron becomes more positively charged on the inside 3) Peak  a) membrane potential is at -55mv b) membrane potential is at +30mv c) sodium ion channels close d) potassium ion channels open e) repolarization begins f) sodium ions leave the neuron 4) Hyperpolarization a) membrane potential goes below the resting potential b) more potassium ions are outside than sodium ions inside the neuron c) sodium and potassium channels open again d) occurs because potassium ion channels close much slowly 5) Refractory period a) neuron returns to resting membrane potential b) membrane potential becomes fixed at -55mv c) brought about by the actions of the sodium-potassium pump d) returns membrane potential to -70mv

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