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15 Cards in this Set

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