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NUR 227 Exam 1 Questions and Correct Answers/ Latest Update / Already Graded

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Define arrhythmia/dysrhythmia Ans: Abnormal heart rhythm Atria ___________ blood Ans: Receive/Collect Ventricles __________ blood Ans: Pump out Purpose of valves Ans: Prevent back flow Keep blood moving in one direction 2 | Page Artery that gives the heart oxygen Ans: Coronary arteries Fuel for the conduction system of the heart Name the 4 major players Ans: Electrolytes Na, K, Ca, Mg Describe the route of cardiac conduction system Ans: SA node→AV node→Bundle of His→R/L bundle branches→Perkinjie fibers Rate of SA node Ans: 60-100 bpm Why does the blood flow pause at the AV node during conduction 3 | Page Ans: To allow for the ventricles to adequately fill If the pacemaker (SA node) of the heart is damaged, the ______ takes over Ans: AV node Rate of AV node Ans: 40-60 bpm Rate of Bundle of His Ans: 20-40 bpm What are pacemaker cells?

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NUR 227 Exam 1 Questions and Correct
Answers/ Latest Update / Already
Graded
Define arrhythmia/dysrhythmia


Ans: Abnormal heart rhythm




Atria ___________ blood


Ans: Receive/Collect




Ventricles __________ blood


Ans: Pump out




Purpose of valves


Ans: Prevent back flow


Keep blood moving in one direction

,2 | Page

Artery that gives the heart oxygen


Ans: Coronary arteries




Fuel for the conduction system of the heart


Name the 4 major players


Ans: Electrolytes


Na, K, Ca, Mg




Describe the route of cardiac conduction system


Ans: SA node→AV node→Bundle of His→R/L bundle branches→Perkinjie

fibers




Rate of SA node


Ans: 60-100 bpm




Why does the blood flow pause at the AV node during conduction

,3 | Page

Ans: To allow for the ventricles to adequately fill




If the pacemaker (SA node) of the heart is damaged, the ______

takes over


Ans: AV node




Rate of AV node


Ans: 40-60 bpm




Rate of Bundle of His


Ans: 20-40 bpm




What are pacemaker cells?


Ans: Excitable cells that send electrical impulses to set the heart rhythm




What are myocardial cells

, 4 | Page

Ans: Contractile cells of the heart




When a cardiac cell outside of the conduction system is irritable,

ischemic, or electrolytes are off can they create an impulse


Ans: Yes!




4 characteristics of cardiac cells allowing heart to respond/receive


Ans: Automaticity


Excitability


Conductivity


Contractility




Define automacity


Ans: Initiate an impulse




Define excitability

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