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Sherpath Basic ECG Interpretation(solved)
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Sherpath Basic ECG Interpretation(solved)
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Sherpath: Basic ECGInterpretation(solved)
Match the property of the cardiac conduction system with its
description.
1) Property of the cell that allows it to accept initiation of
stimulation
2) Property that moves electrical impulse along a membrane
3) Ability of heart muscle to respond mechanically to an
impulse
4) Ability of heart muscle to respond mechanically to an
impulse
1) Excitability
2) Conductivity
3) Contractility
,4) Automaticity
List in order the pathway of the normal cardiac impulse starting
at the SA node.
1) The impulse causes the atria to contract.
2) The impulse divides into the left and right bundle branches.
3) The ventricles contract.
4) The impulse travels from the AV node through the bundle of
His.
5) The impulse reaches the Purkinje fibers.
1, 4, 2, 5, 3
The SA node begins the normal cardiac cycle. The impulse
travels from the SA node in the upper right atrium to the
interatrial and intermodal pathways. The atrium contracts. The
impulse continues to the AV node following the bundle of His to
the bundle branches. The impulse ends in the Purkinje fibers
that send the impulse to the ventricles. The ventricles then
contract.
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An increase in the rate of cardiac impulse initiation is linked to
stimulation of which component?
A) Purkinje system
B) Electrolyte system
C) Sympathetic nervous system
D) Parasympathetic nervous system
C) Sympathetic nervous system
The sympathetic nervous system is responsible for increasing
the rate of cardiac impulse initiation at the SA node. It also
assists with node impulse conduction and cardiac contractility.
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