UCLA EKG test (2026) comprehensive questions
and verified answers ( detailed & elaborated)
ACTUAL EXAM 2026 TEST!!
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Practice questions for this set
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Rhythm: regular ( both atrial and ventricular)
Rate < 60
P wave: present, upright,
Site of pacemaker: SA node
PR interval: normal ( 0.12-0.20)
QRS: (0.04- 0.20)
QT: < 0.46
Conduction: 1:1 relationship, each P wave followed by QRS
Choose an answer
Sinus bradycardia ( rhythm, rate, P
1 wave, site of pacemaker, PR interval , 2 electrically polarized at rest
QRS, QT interval , conduction)
, 4 Phases of Electrophysiology of the
3 Placement of precordial leads 4
heart cell
Don't know?
Terms in this set (81)
electrically polarized at rest - inside of heart cell has a high potassium
concentration, whereas the outside has a higher
concentration of NA
-higher positive charge outside the cell cause more
negative charge inside cell
electrical potential difference between the charges outside and inside
of the cell wall
Depolarization NA moves into the cell rapidly in response to an
electrical impulse
- inside cell loses negative potential
Replolarization ions return to their original resting state
- heart cells restore their resting polarity
4 Phases of Electrophysiology of the Phase 0: Na flow in and rapid depolarization
heart cell 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
, Pacemaker cells - Sinoatrial node ( SA) node
-Atrioventricular node )AV node
- Purkinjie fibers
SA node -primary pacemaker
- Rate: 60-100
- SA node depolarizes the atria via intro nodal
tracts and Bachmann;s bundle = resulting in atrial
contraction
AV node - responsible for slowing down conduction from
the atria to ventricles just long enough for atrial
contraction to occur
- rate: 40-60
Bundle of His - divides left and right branches
-impulses are conducted down LBB faster than
RBB, allowing both ventricles to contract at same
time
Purkunje fibers - send impulses into mycardial tissues of the
ventricles and causes them to contract
- rate: 20-40
Myocardial cells -contractile machinery of the heart
- myocardial cell is deplolarized, CA is released
within cell causing cell to contract
Normal ranges for electrolytes NA: 135- 146 meq/L
K: 3.6-5.3 meq/L
Ca: 8.5- 10.3 mg/dl
Ionized Ca: 1.09 -1.29
Mg: 1.4- 1.9 mEq/L
and verified answers ( detailed & elaborated)
ACTUAL EXAM 2026 TEST!!
Save
Practice questions for this set
Learn 1 /7 Study with Learn
Rhythm: regular ( both atrial and ventricular)
Rate < 60
P wave: present, upright,
Site of pacemaker: SA node
PR interval: normal ( 0.12-0.20)
QRS: (0.04- 0.20)
QT: < 0.46
Conduction: 1:1 relationship, each P wave followed by QRS
Choose an answer
Sinus bradycardia ( rhythm, rate, P
1 wave, site of pacemaker, PR interval , 2 electrically polarized at rest
QRS, QT interval , conduction)
, 4 Phases of Electrophysiology of the
3 Placement of precordial leads 4
heart cell
Don't know?
Terms in this set (81)
electrically polarized at rest - inside of heart cell has a high potassium
concentration, whereas the outside has a higher
concentration of NA
-higher positive charge outside the cell cause more
negative charge inside cell
electrical potential difference between the charges outside and inside
of the cell wall
Depolarization NA moves into the cell rapidly in response to an
electrical impulse
- inside cell loses negative potential
Replolarization ions return to their original resting state
- heart cells restore their resting polarity
4 Phases of Electrophysiology of the Phase 0: Na flow in and rapid depolarization
heart cell 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
, Pacemaker cells - Sinoatrial node ( SA) node
-Atrioventricular node )AV node
- Purkinjie fibers
SA node -primary pacemaker
- Rate: 60-100
- SA node depolarizes the atria via intro nodal
tracts and Bachmann;s bundle = resulting in atrial
contraction
AV node - responsible for slowing down conduction from
the atria to ventricles just long enough for atrial
contraction to occur
- rate: 40-60
Bundle of His - divides left and right branches
-impulses are conducted down LBB faster than
RBB, allowing both ventricles to contract at same
time
Purkunje fibers - send impulses into mycardial tissues of the
ventricles and causes them to contract
- rate: 20-40
Myocardial cells -contractile machinery of the heart
- myocardial cell is deplolarized, CA is released
within cell causing cell to contract
Normal ranges for electrolytes NA: 135- 146 meq/L
K: 3.6-5.3 meq/L
Ca: 8.5- 10.3 mg/dl
Ionized Ca: 1.09 -1.29
Mg: 1.4- 1.9 mEq/L
