Answer KeyWorksheet1.Number in order the following components of the conduction system. Begin with the primary pacemaker site. Fill in inherent rate of components. FunctionInherent Rate 6 Purkinje fibers Ensure ventricles contract as an unit20 - 40 3 AV nodeHold impulse to ensure atria finish contracting – 2nd pacemaker site40 - 60 5 right & left bundle branchesMoves impulse to purkinje 1 SA nodePrimary pacemaker60 - 100 4 bundle of hisMove impulse from atria to ventricles 2 intranodal tracts or pathwaysEnsures atria contract as an unit2.Match the following definition of refractory periods (may use more than once)a.Supernormal periodb.Absolute refractoryc.Relative refractory B cells can not be depolarized regardless of stimulus C can be stimulated to depolarize if the stimulus is strong enough A a stimulus weaker than normal can depolarize cells C from the middle of phase 3 to the end of phase 3 A short portion of phase 3 just before the cells return to their resting potential B from the beginning of phase 0 to the middle of phase 33.Match the following: E Phase 4 (resting state between action potentials) A Phase 0 (depolarization phase) D Phase 1 (early rapid repolarization) B
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- Fall '15
- right ventricle