8/17/25, 8:02
AM
NR 341 EXAM 2 PP EXAM QUESTIONS AND
ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
LATEST UPDATED VERSION 2025/2026
Terms in this set (250)
Automaticity is the ability to initiate an impulse spontaneously
and continuously
Excitability • is the ability to be electrically stimulated.
Conductivity • is the ability to transmit an impulse along a
membrane in an orderly manner.
Contractility • is the ability to respond mechanically to an
impulse.
hypoxia
cardiac disease
recreation
Causes of al drugs
dysrhythmias medication
electrolyte
imbalance
endocrine
disorders
Automatici
ty
Properties of Cardiac Excitability
Cells Conductivi
1/
25
,8/17/25, 8:02
AM
ty
Contractilit
y
vagus nerve fibers of the parasympathetic
nervous system,
-Stimulation of the vagus nerve causes a
Parasympathetic decreased rate of firing of the SA node
nervous system and slowed impulse conduction of the AV
controls node.
Decreases rate of SA node
Slows impulse conduction of AV node
2/
25
, 8/17/25, 8:02
AM
nerve fibers of the sympathetic nervous system,
-Stimulation of the sympathetic nerves
increases SA node firing, AV node impulse
conduction, and cardiac contractility.
Sympathetic nervous
system controls Increases rate of SA node
Increases impulse
conduction of AV node
Increases cardiac
contractility
Dysrhythmias result impulse formation, conduction of impulses, or
from disorders of both.
SA node normal pacemaker of heart (60-100 beats/minute)
AV node (40-60 beats/minute)
Secondary
pacemakers His-Purkinje fibers (20-40 beats/minute)
The P wave represents time for the passage of the electrical
impulse through the atrium causing atrial
depolarization (contraction).
measured the beginning of the P wave to the
beginning of the QRS complex.
The PR interval is
measured from It represents the time taken for the impulse
and represents to spread through the atria, AV node, and
bundle of His; the bundle branches; and
Purkinje fibers to a point immediately
preceding ventricular contraction.
3/
25
AM
NR 341 EXAM 2 PP EXAM QUESTIONS AND
ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
LATEST UPDATED VERSION 2025/2026
Terms in this set (250)
Automaticity is the ability to initiate an impulse spontaneously
and continuously
Excitability • is the ability to be electrically stimulated.
Conductivity • is the ability to transmit an impulse along a
membrane in an orderly manner.
Contractility • is the ability to respond mechanically to an
impulse.
hypoxia
cardiac disease
recreation
Causes of al drugs
dysrhythmias medication
electrolyte
imbalance
endocrine
disorders
Automatici
ty
Properties of Cardiac Excitability
Cells Conductivi
1/
25
,8/17/25, 8:02
AM
ty
Contractilit
y
vagus nerve fibers of the parasympathetic
nervous system,
-Stimulation of the vagus nerve causes a
Parasympathetic decreased rate of firing of the SA node
nervous system and slowed impulse conduction of the AV
controls node.
Decreases rate of SA node
Slows impulse conduction of AV node
2/
25
, 8/17/25, 8:02
AM
nerve fibers of the sympathetic nervous system,
-Stimulation of the sympathetic nerves
increases SA node firing, AV node impulse
conduction, and cardiac contractility.
Sympathetic nervous
system controls Increases rate of SA node
Increases impulse
conduction of AV node
Increases cardiac
contractility
Dysrhythmias result impulse formation, conduction of impulses, or
from disorders of both.
SA node normal pacemaker of heart (60-100 beats/minute)
AV node (40-60 beats/minute)
Secondary
pacemakers His-Purkinje fibers (20-40 beats/minute)
The P wave represents time for the passage of the electrical
impulse through the atrium causing atrial
depolarization (contraction).
measured the beginning of the P wave to the
beginning of the QRS complex.
The PR interval is
measured from It represents the time taken for the impulse
and represents to spread through the atria, AV node, and
bundle of His; the bundle branches; and
Purkinje fibers to a point immediately
preceding ventricular contraction.
3/
25
