EKG TEST #1 WITH CORRECT
ANSWERS 2025
What cells cause the heart to contract? ( correct answers )
Contractile cells
What creates and conducts impulses to regulate the cardiac cycle?
( correct answers
) Conduction system cells
What controls involuntary bodily functions and has two subdivisions?
( correct answers ) Autonomic nervous system
Sympathetic nervous system ( correct answers ) Fight or
flight. Hits the accelerator.
How does depolarization occur? ( correct answers )
Change in the cardiac cell's electrical charge from negative to positive.
Accomplished by sodium and potassium ions changing place. Causes a wave
of electrical to course from cell to cell, resulting in a discharge of electricity.
How does repolarization occur? ( correct answers )
Return of the cardiac cell to its electrically negative charge. Accomplished
by way of the Na+ K+ pump, an active transport system.
Depolarization should result in? ( correct
answers )Heart muscle contraction Repolarization should result in?
( correct answers ) Heart muscle
relaxation Phase 4 ( correct answers ) Cardiac cell at rest
Phase 0 ( correct answers ) Depolarization
Phases 1 & 2 ( correct answers ) Early
repolarization Phase 2 ( correct answers )
Plateau phase
Phase 3 ( correct answers ) Rapid
repolarization
GRADED
A+
Absolute refractory ( correct answers ) No
stimulus can cause depolarization Relative refractory ( correct answers )
Strong stimulus can cause depolarization
, Supernormal ( correct answers ) Even a weak stimulus can
period cause
depolarization
P wave ( correct answers ) Atrial depolarization
Ta wave ( correct answers ) Atrial repolarization. Not usually seen, as
it occurs simultaneous with QRS
QRS complex ( correct answers ) Ventricular depolarization
T wave ( correct answers ) Ventricular repolarization
U wave ( correct answers ) Late ventricular repolarization. Not
usually seen. Pace maker of the heart ( correct answers ) SA
node
Counting horizontally on EKG paper measures what? ( correct answers )
Intervals Counting vertically measures what? ( correct answers )
Amplitude
One small block ( correct answers ) 0.04 sec
Five small blocks ( correct answers ) One
big block One big block ( correct
answers ) 0.20 sec
25 small blocks ( correct answers )
1 sec Five big blocks
( correct answers ) 1
sec
1500 small blocks ( correct answers ) 1
minute 300 big blocks ( correct
answers ) 1 minute
12 lead EKG ( correct answers ) Printout of the heart's electrical activity
viewed from 12 different angles as seen in 12 different leads.
GRADED
A
A+
lead is an electrocardiographic picture of the heart's electrical activity.
( correct answers ) ...
Rhythm Strip ( correct answers ) Printout of only one or
ANSWERS 2025
What cells cause the heart to contract? ( correct answers )
Contractile cells
What creates and conducts impulses to regulate the cardiac cycle?
( correct answers
) Conduction system cells
What controls involuntary bodily functions and has two subdivisions?
( correct answers ) Autonomic nervous system
Sympathetic nervous system ( correct answers ) Fight or
flight. Hits the accelerator.
How does depolarization occur? ( correct answers )
Change in the cardiac cell's electrical charge from negative to positive.
Accomplished by sodium and potassium ions changing place. Causes a wave
of electrical to course from cell to cell, resulting in a discharge of electricity.
How does repolarization occur? ( correct answers )
Return of the cardiac cell to its electrically negative charge. Accomplished
by way of the Na+ K+ pump, an active transport system.
Depolarization should result in? ( correct
answers )Heart muscle contraction Repolarization should result in?
( correct answers ) Heart muscle
relaxation Phase 4 ( correct answers ) Cardiac cell at rest
Phase 0 ( correct answers ) Depolarization
Phases 1 & 2 ( correct answers ) Early
repolarization Phase 2 ( correct answers )
Plateau phase
Phase 3 ( correct answers ) Rapid
repolarization
GRADED
A+
Absolute refractory ( correct answers ) No
stimulus can cause depolarization Relative refractory ( correct answers )
Strong stimulus can cause depolarization
, Supernormal ( correct answers ) Even a weak stimulus can
period cause
depolarization
P wave ( correct answers ) Atrial depolarization
Ta wave ( correct answers ) Atrial repolarization. Not usually seen, as
it occurs simultaneous with QRS
QRS complex ( correct answers ) Ventricular depolarization
T wave ( correct answers ) Ventricular repolarization
U wave ( correct answers ) Late ventricular repolarization. Not
usually seen. Pace maker of the heart ( correct answers ) SA
node
Counting horizontally on EKG paper measures what? ( correct answers )
Intervals Counting vertically measures what? ( correct answers )
Amplitude
One small block ( correct answers ) 0.04 sec
Five small blocks ( correct answers ) One
big block One big block ( correct
answers ) 0.20 sec
25 small blocks ( correct answers )
1 sec Five big blocks
( correct answers ) 1
sec
1500 small blocks ( correct answers ) 1
minute 300 big blocks ( correct
answers ) 1 minute
12 lead EKG ( correct answers ) Printout of the heart's electrical activity
viewed from 12 different angles as seen in 12 different leads.
GRADED
A
A+
lead is an electrocardiographic picture of the heart's electrical activity.
( correct answers ) ...
Rhythm Strip ( correct answers ) Printout of only one or
