UCLA EKG STUDY QUESTIONS WITH GUARANTEED ACCURATE ANSWERS
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UCLA EKG Study
Institution
UCLA EKG Study
What does it mean when the heart is electrically polarized at rest? - Accurate AnswersThe inside of the heart cell has a higher potassium concentration, whereas the outside has a higher concentration of sodium.
• The higher positive charge outside the cell causes a relatively more negative charg...
UCLA EKG STUDY QUESTIONS
WITH GUARANTEED ACCURATE
ANSWERS
What does it mean when the heart is electrically polarized at rest? -
Accurate Answers✔✔The inside of the heart cell has a higher potassium
concentration, whereas the outside has a higher concentration of sodium.
• The higher positive charge outside the cell causes a relatively more
negative charge inside the cell.
• The difference between the charges outside and inside of the cell wall
is known as its electrical potential.
What occurs during depolarization within the heart cell? - Accurate
Answers✔✔Na+ moves into the cell rapidly in response to an electrical
impulse: Inside of cell loses negative
potential.
Depolarization is propagated from cell to cell, transmitted across the
entire heart.
• The wave of depolarization represents a flow of electricity.
What happens in repolarization of the heart? - Accurate Answers✔✔The
ions return to their original resting state and the heart cells restore their
resting polarity.
,List in phases the electrophysiology of the heart - Accurate
Answers✔✔Phase 0: Na+ flow in and rapid depolarization occurs
when stimulated
Phase 1: Rapid return to isoelectric level
Phase 2: Ca++ ions flow in and myocytes contract
Phase 3: K+ flow out and rapid depolarization occurs
Phase 4: Polarized resting phase
Name the three different type of heart cells - Accurate
Answers✔✔Allow the heart to integrate electrical and mechanical
activity of the heart
1. Pacemaker cells
2. Electrical conduction cells
3. Myocardial cells
What do pacemaker cells do? - Accurate Answers✔✔Pacemaker cells
have the ability to initiate an impulse
(automaticity)
o Sinoatrial (SA) node:
o Atrioventricular (AV) node
o Purkinje fibers
o Every cell in the heart has automaticity, but normally suppressed.
, What do the electrical conduction cells do? - Accurate
Answers✔✔Wires of the heart's electrical circuit
• Carry current rapidly and efficiently to distant regions of the heart
What is electrical pathway of the heart starting from SA node - Accurate
Answers✔✔Sinoatrial (SA) node ->Internodal pathways -
>Atrioventricular (AV) node->Bundle of His->Bundle branches ->
Purkinje fibers
What is the pathophysiology of the SA node - Accurate Answers✔✔SA
(Sinoatrial) Node • Located in the right atrium near
the superior vena cava
• Primary pacemaker • Inherent rate: 60-100 bpm • Innervated by
autonomic nervous
system
• Electrical impulses from SA node
"depolarizes" the atria via
internodal tracts and
Bachmannn's bundle, resulting in
atrial contraction.
What is the pathophysiology of the AV node? - Accurate Answers✔✔AV
(Atrioventricular) Node • Located in the inferior right
atrium
• Responsible for slowing down
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