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15 Cards in this Set
- Front
- Back
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Initiate impulse by pacemaker
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Automaticity
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Conductive tissue
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Conductivity
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Amount of stimulus
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Excitability
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Time cells can't respond to impulser
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Refractoriness
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Cells are incapable of responding during the ___ period
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Absolute refractory period
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Greater than normal stimulus can initiate impulse during the __ period
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Relative refractory period
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Influx of sodium & calcium into cells causes
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atrial depolarization
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Intraventricular pressure exceeds intra atrial pressure which causes
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AV closure
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Intraventricular pressure exceeda pressure in the aorta & pulmonary arteries which causes
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opening of the aortic and pulmonic valve
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Function is support, protect, and nourishment
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Neuroglia
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Produce myelin sheath in the CNS
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Oligodendrites
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Structural support, form BBB, phagocyte when injured
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Astrocytes
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Line ventricles and aid in CSF secretion
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Ependymal cells
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Macrophage, host defense
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Microglia
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Involved in tranmission of impulse across the synaptic cleft
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Neurotransmitters
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