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AHN 568 Unit 1 Exam Study Questions and Answers 100% Pass.
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AHN 568 Unit 1 Exam Study Questions and Answers 100% Pass. Sinoatrial Node (SA node) Rate? Location & Area of intervention? EKG? - ANSWER-Natural pacemaker of the heart Rate: 60-100 bpm Location: Upper portion posterior portion of the Right Atrium near superior vena cava EKG: represented a...

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  • November 25, 2024
  • 38
  • 2024/2025
  • Exam (elaborations)
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  • ahn 568 unit 1 exam study questions and answers 10

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AHN 568 Unit 1 Exam Study Questions
and Answers 100% Pass.


Sinoatrial Node (SA node)


Rate?


Location & Area of intervention?


EKG? - ANSWER✔✔-Natural pacemaker of the heart


Rate: 60-100 bpm


Location: Upper portion posterior portion of the Right Atrium near

superior vena cava


EKG: represented as the P wave


Atrioventricular node (AV node)


Rate?


Location? - ANSWER✔✔-A specialized mass of conducting cells located at

the atrioventricular junction in the heart. (back-up pacer of the heart

Copyright ©EMILLYCHARLOTE 2025 ACADEMIC YEAR, ALL RIGHTS RESERVED. Page 1/38

,Rate 40-60 bpm


Location: Near the tricuspid valve


Bundle of HIS


Rate?


Location? - ANSWER✔✔-pathway for electrical signals to be transmitted to

the ventricles


Rate: 40-45 bpm


Location: partially in right atrium and upper portion of interventricular

septum that connects the AV node and 2 bundle branches


Purkinjie Fibers


Rate? - ANSWER✔✔-hair-like fibers that spread out from bundle branches

into the ventricles; innervate myocardial cells directly; initiate ventricular

depolarization


Rate: 20-40 bpm


Normal Conduction Pathway through the Heart - ANSWER✔✔-SA node


Interatrial tracts

Copyright ©EMILLYCHARLOTE 2025 ACADEMIC YEAR, ALL RIGHTS RESERVED. Page 2/38

,AV node


Bundle of His


Bundle branches


Purkinje fibers


resting membrane potential - ANSWER✔✔-Electrical charge of cardiac

muscle cells at rest


Depolarization - ANSWER✔✔-change in the electrical charge of a

stimulated cell from negative to positive by the flow of ions; Na+ allows for

depolarization, except in AV node which depends on the slow moving

Ca2+


Repolarization - ANSWER✔✔-recharging of a cell to its normal polarity;

K+ allows for repolarization


action potential - ANSWER✔✔-as cardiac cells reverse polarity, the

electrical impulse generated during that event creates an energy stimulus

that travels across the cell membrane


What ion causes contraction? - ANSWER✔✔-Calcium


Copyright ©EMILLYCHARLOTE 2025 ACADEMIC YEAR, ALL RIGHTS RESERVED. Page 3/38

, Phase 4 - ANSWER✔✔-Phase 4: Resting State


Na+ and Ca2+ channels are closed; increase in K+ permeability to allow for

a new cycle


Phase 0 - ANSWER✔✔-Phase 0: Rapid depolarization


Opening of voltage-gated fast Na+ channels; cell fires to initiate

transmission of electrical impulse


Phase 1 - ANSWER✔✔-Phase 1: Depolarization


Peak positive charge; K+ closes, Cl- enters to slow channels, slow Ca2+

channels open


Phase 2 - ANSWER✔✔-Phase 2 Plateau


Opening of voltage gated slow Ca2+ channels and closing of some K+,

some Na+ enters to maintain; membrane potential is maintained or

plateaued


Phase 3 - ANSWER✔✔-Phase 3 Re-polarization


Opening of voltage-gated K+ channels and closing of Ca2+ channels; K+

moves from ICF to ECF


Copyright ©EMILLYCHARLOTE 2025 ACADEMIC YEAR, ALL RIGHTS RESERVED. Page 4/38

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