13. Local Potentials & Threshold

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14 Terms

1
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What is a small localized change in membrane potential called?
Local potential
2
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In which neuron segment do local potentials occur?
Receptive segment
3
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What determines the magnitude of a local potential?
Stimulus strength
4
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What type of channels open to produce a local potential?
Ligand-gated channels
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Why are local potentials called decremental?
Die out with distance
6
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What ion movement causes a depolarizing local potential?
Positive ion entry
7
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What physiological effect does a depolarizing local potential have?
Stimulatory
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What ion movements cause a hyperpolarizing local potential?
Positive ions exit or negative ions enter
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What physiological effect does a hyperpolarizing local potential have?
Inhibitory
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To what anatomical site must local potentials travel to trigger an action potential?
Trigger zone
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What is the minimum membrane potential required to fire an action potential?
Threshold
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What is the threshold voltage value in a neuron?
-55 to -60 mV
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What opens when a neuron membrane reaches threshold?
Voltage-gated sodium channels
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What principle states that an action potential fires completely or not at all?
All-or-none principle