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11 Cards in this Set

  • Front
  • Back
Cardiac myocytes have _ that allow for rapid relay of electrical signals between them
Gap junctions
Name 3 parts of electrical conduction system of heart
SA node
AV node
His-Purkinje cells
Normal pacemaker of the heart
SA node
SA node exhibits automaticity in which spontaneous _ generates rhythmic AP's
PHASE 4 DEPOLARIZATION
Nodal tissues are dependent on _ for their phase 0 depolarization whereas cardiac muscular tissue uses _ for phase 0 depolarization
Ca

Na
_ transmits AP's more slowly then other cardiac tissues
AV node
This feature allows atria to contract before ventricles with time for ventricles to repolarize, fill with blood and prepart to receive their next electrical signal
Slowing down at AV node
_ effects on the heart cause a change in heart rate by affecting the rate of depolarization of SA node
CHRONOTROPIC
_ effects cause change in contractility of the heart
INOTROPIC
Increased intracellular Ca increases inotropic or chronotropic effects
Inotropic
Increased preload or afterload owing to increased filling of ventricles lengthens myocytes which induces stronger contraction
PRELOAD