NURS 2245 - Dysrhythmias | Macomb Community College | Questions with
100% Verified Answers | Latest Update
Question: this is the ability of cardiac cells to generate an electrical
impulse spontaneously and repetitively
Answer:
automaticity heart beats automatically
Question: this is the ability to send an electrical stimulus from cell
membrane to cell membrane
Answer:
conductivity the hearts ability to conduct electricity
Question: this is the ability of non-pacemaker heart cells to respond to
an electrical impulse that begins in pacemaker cells
Answer:
excitability (also called depolarization) responding rather too readily to something new or
stimulating
Question: the inability to respond to an impulse
Answer:
refractoriness
Question: this is the ability of atrial and ventricular muscles cells to
shorten their fiber length in response to electrical stimulation, causing
sufficient pressure to push blood forward through the heart
Answer:
contractility (in other words contractility is the mechanical activity of the heart)
Question: this provides a graphic representation or a picture of cardiac
electrical activity
Answer:
electrocardiogram (ECG)
Question: what are the waves of depolarization in the ECG
Answer:
P-wave and QRS complex
,Question: isoelectric line
Answer:
the baseline of the ECG (no electrical activity is occurring)
Question: out of the 10 electrodes in a 12-lead, what are the two
categories
Answer:
limb leads or chest leads 4 limb leads, 6 chest leads
Question: small blocks on a ECG represent how many seconds
Answer:
0.04 seconds
Question: five small blocks on an ECG make up one large block which
is how many seconds
Answer:
0.20 seconds
Question: how many large blocks represent one second on an ECG
Answer:
5
Question: how many small blocks make up six seconds in an ECG
Answer:
30
,Question: in what node does conduction begin
Answer:
SA node located close to the surface of the right atrium near its junction with the superior
vena cava
Question: this wave is a deflection representing atrial depolarization
Answer:
P-wave
Question: what is the heart's primary pacemaker what is it supplied
by
Answer:
SA node it's supplied by the sympathetic and parasympathetic nervous system, which
increase and decrease the rate of discharge of the sinus node (this results in changes in the
heart rate)
Question: what does atrial depolarization mean
Answer:
it means the cell's membrane potential becomes positive because of an electrical signal from
the SA node. this leads to contraction
, Question: atrial depolarization is reflected in what wave on an ECG
Answer:
P-wave
Question: the atrioventricular junction consists of what (3)
Answer:
AV node itself, transitional cell zone, and bundle of His
100% Verified Answers | Latest Update
Question: this is the ability of cardiac cells to generate an electrical
impulse spontaneously and repetitively
Answer:
automaticity heart beats automatically
Question: this is the ability to send an electrical stimulus from cell
membrane to cell membrane
Answer:
conductivity the hearts ability to conduct electricity
Question: this is the ability of non-pacemaker heart cells to respond to
an electrical impulse that begins in pacemaker cells
Answer:
excitability (also called depolarization) responding rather too readily to something new or
stimulating
Question: the inability to respond to an impulse
Answer:
refractoriness
Question: this is the ability of atrial and ventricular muscles cells to
shorten their fiber length in response to electrical stimulation, causing
sufficient pressure to push blood forward through the heart
Answer:
contractility (in other words contractility is the mechanical activity of the heart)
Question: this provides a graphic representation or a picture of cardiac
electrical activity
Answer:
electrocardiogram (ECG)
Question: what are the waves of depolarization in the ECG
Answer:
P-wave and QRS complex
,Question: isoelectric line
Answer:
the baseline of the ECG (no electrical activity is occurring)
Question: out of the 10 electrodes in a 12-lead, what are the two
categories
Answer:
limb leads or chest leads 4 limb leads, 6 chest leads
Question: small blocks on a ECG represent how many seconds
Answer:
0.04 seconds
Question: five small blocks on an ECG make up one large block which
is how many seconds
Answer:
0.20 seconds
Question: how many large blocks represent one second on an ECG
Answer:
5
Question: how many small blocks make up six seconds in an ECG
Answer:
30
,Question: in what node does conduction begin
Answer:
SA node located close to the surface of the right atrium near its junction with the superior
vena cava
Question: this wave is a deflection representing atrial depolarization
Answer:
P-wave
Question: what is the heart's primary pacemaker what is it supplied
by
Answer:
SA node it's supplied by the sympathetic and parasympathetic nervous system, which
increase and decrease the rate of discharge of the sinus node (this results in changes in the
heart rate)
Question: what does atrial depolarization mean
Answer:
it means the cell's membrane potential becomes positive because of an electrical signal from
the SA node. this leads to contraction
, Question: atrial depolarization is reflected in what wave on an ECG
Answer:
P-wave
Question: the atrioventricular junction consists of what (3)
Answer:
AV node itself, transitional cell zone, and bundle of His
