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27 Cards in this Set
- Front
- Back
Corresponds to the period of repolarization of the neuron.
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Relative Refractory Period
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Process by which the resting potential is decreased as sodium ions move into the axon.
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Depolarization
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State of an unstimulated Neuron's membrane
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Polarized
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Period (event) during which potassium ions move out of the axon.
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Repolarization
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Also called the nerve impulse
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Action Potential
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Period when a neuron cannot be restumulated because its sodium gates are open and an AP is being generated.
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Absolute Refractory Period
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Mechanism by which ATP is used to move sodium ions out of the cell and potassium ions into the cell; completely restores and maintains the resting conditions of the neuron.
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Sodium Potassium Pump
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Point at which an axon "fires"
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Threshold
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Term for a weak stimulus
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Subthreshold
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Self propagated depolarization
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Action Potential
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Codes for intensity of the stimulus
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Frequency of impulses
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Membrane potential at which the outward current carried by K+ is exactly equal to the inward current carried by Na+
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Threshold
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A voltage change that reduces the ability of a neuron to conduct an impulse; the membrane potential becomes more negative.
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Hyperpolarization
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A local change in the membrane potential in which current flow is quickly dissipated; that is, decremental.
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Graded Potential
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An all or none electrical event
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Action Potential
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A voltage change that brings a neuron closer to its threshold for firing; the membrane potential becomes less negative and moves towards 0
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Depolarization
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Results from the opening of voltage regulated ionic gates
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Action Potential
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Results from the opening of chemically regulated gates or energetic stimuli
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Graded potential
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Characterized by a rapid polarity reversal
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Action Potential
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Junction or point of close contact between neurons
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Synapse
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Chemicals released by neurons that stimulate other neurons, muscles, or glands.
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Neurotransmitters
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Gaps in a myelin sheath
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Nodes of Ranvier
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Bundle of axons in the CNS
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Tract
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Collection of cell bodies found outside the CNS
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Ganglion
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Collection of cell bodies found within the CNS
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Nucleus
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Changes, occuring inside or outside the body, that activate the nervous system
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Stimuli
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Bundle of axons in the PNS
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Nerve
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