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18 Cards in this Set
- Front
- Back
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What structures are part of the central nervous system |
The brain, spinal chord, a tract |
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What type of supporting cell is found in myelinates nerve fibers in the CNS |
Oligodendrocyte |
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What is the supporting cell that lines the brain cavities |
Ependymal cell |
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What is the supporting cell that myelinates nerve fibers in the peripheral nervous system |
Schwann cell |
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What is the supporting cell found in the CNS phagocyte |
Microglial cell |
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What is the supporting cell that helps regulate the ionic composition of extracellular fluid |
Astrocyte |
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What type of current flows through the axolemma during the Steep phase of repolarization |
Potassium |
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Assume that an epsp is being generated on the dendritic membrane. What will occur? |
A single type of channel will open, permitting simultaneous flow of sodium and potassium |
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When is the velocity of nerve impulse conduction the greatest |
Heavily myelinated, large-diameter fibers |
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What are characteristics of chemical synapses |
The release of neurotransmitter by the presynaptic membranes, postsynaptic membrane spearing receptors that bind neurotransmitters, a fluid-filled Gap separating the neurons |
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What hormone are included in biogenic amine neurotransmitter |
Norepinephrine, dopamine, serotonin |
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What are neuropeptides that act as natural opiates |
Enkephalins |
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What is the anatomical region of a multipolar neuron where the AP is initiated |
The Axon hillock |
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Why is an IPSP inhibitory |
It Hyper polarizes the postsynaptic membrane |
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Identify the neuronal circuit: Impulses continue around and around the circuit until one neuron stops firing |
Reverberating |
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Identify the neuronal circuit: One or a few inputs ultimately influence a large number of neurons |
Diverging |
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Identify the neuronal circuits: Many neurons influence a few neurons |
Converging |
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Identify the neuronal circuits: May be involved in exacting types of mental activity |
Parallel after discharge |
