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Cards In This Set
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Blood Brain Barrier
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Keeps most chemicals out of the brain through tight cell junctions
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Temporal Summation
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Repeat stimuli within a brief time have a cumulative effect (bucket with hole in it) graded potential
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Spatial Summation
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Several synaptic inputs originating from separate locations combine their effects on a neuron
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Refractory Period
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Cell resists the production of further action potentials
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Afferent Neurons
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Brings information INTO a structure; usually CNS
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Efferent Neurons
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Carries information AWAY from a structure; usually CNS
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Hyperpolarization
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Increased polarization; more negative charge inside
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Depolarization
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Reduce polarization toward zero; even charge on the inside and outside
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Action Potential
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Stimulation beyond threshold, rapid depolarization & slight reversal of usual polarization
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Graded potential
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Subthreshold produces proportional response, dont follow all or none law
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Synapse
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Point of communication at the gap between two neurons or between a neuron and a muscle
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Neurotransmitter
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Chemicals released by one neuoron at a synapse that affects a second neuron
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Presynaptic Neuron
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Neuron sending message
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Postsynaptic Neuron
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Neuron receiving message
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Inhibitory synapses
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Input from presynaptic axon hyperpolarizes the postsynaptic celll (makes postsynaptic less likely to fire)
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