ECG Interpretation (Mayo) - Questions With
Verified Solutions
What ventricle/atria carry oxygenated blood Correct Ans - left
ventricle/atria
What ventricle/atria carry de-oxygenated blood Correct Ans -
right ventricle/atria
What is the function of the coronary arteries Correct Ans - to
feed the heart with blood
blockage = no oxygen to heart
List the unique properties of cardiac muscle Correct Ans -
automaticity- initiate impulses
excitability- respond to stimuli
conductivity- electrical impulse
contractibility- shortening muscle fibers
refractoriness- respond to electrical stimuli by depolarization,
absolute (not possible for excitation, no impulse), relative (excitable
but requires a strong stimuli = disorganized rhythm)
The cardiac cycle is electrical or mechanical Correct Ans -
mechanical
What makes up the cardiac cycle Correct Ans - systole
(contraction) and diastole (relaxation)
What is the definition of cardiac output Correct Ans - the
amount of blood pumped out of the ventricles in one minute
What are 2 electrical events of the heart Correct Ans -
depolarization and repolarization
, Define depolarization Correct Ans - discharge state of
myocardial cells or the action state/contraction of myocardial
Define repolarization Correct Ans - recovery state of
myocardial cells or the resting state of myocardial
List the order of the conduction system with proper rates Correct
Ans - 1. SA node (60-100)
2. intra-atrial pathways
3. AV node
4. junctional tissue (40-60)
5. bundle of HIS
6. bundle branches
7. purkinje fibers
8. ventricular tissue (20-40)
Describe the SA node in the conduction system Correct Ans - -
normal pacemaker of the heart
- 60-100 bpm
- located in RA
Where is the SA node located on the heart Correct Ans -
located in the upper wall of the right atrium
Describe the intra-atrial pathways in the conduction system
Correct Ans - - connect SA node to AV node
- conducts the impulse from SA node to AV node
Where are the intra-atrial pathways located on the heart Correct
Ans -
Describe the AV node in the conduction system Correct Ans - -
located on the floor of RA
Verified Solutions
What ventricle/atria carry oxygenated blood Correct Ans - left
ventricle/atria
What ventricle/atria carry de-oxygenated blood Correct Ans -
right ventricle/atria
What is the function of the coronary arteries Correct Ans - to
feed the heart with blood
blockage = no oxygen to heart
List the unique properties of cardiac muscle Correct Ans -
automaticity- initiate impulses
excitability- respond to stimuli
conductivity- electrical impulse
contractibility- shortening muscle fibers
refractoriness- respond to electrical stimuli by depolarization,
absolute (not possible for excitation, no impulse), relative (excitable
but requires a strong stimuli = disorganized rhythm)
The cardiac cycle is electrical or mechanical Correct Ans -
mechanical
What makes up the cardiac cycle Correct Ans - systole
(contraction) and diastole (relaxation)
What is the definition of cardiac output Correct Ans - the
amount of blood pumped out of the ventricles in one minute
What are 2 electrical events of the heart Correct Ans -
depolarization and repolarization
, Define depolarization Correct Ans - discharge state of
myocardial cells or the action state/contraction of myocardial
Define repolarization Correct Ans - recovery state of
myocardial cells or the resting state of myocardial
List the order of the conduction system with proper rates Correct
Ans - 1. SA node (60-100)
2. intra-atrial pathways
3. AV node
4. junctional tissue (40-60)
5. bundle of HIS
6. bundle branches
7. purkinje fibers
8. ventricular tissue (20-40)
Describe the SA node in the conduction system Correct Ans - -
normal pacemaker of the heart
- 60-100 bpm
- located in RA
Where is the SA node located on the heart Correct Ans -
located in the upper wall of the right atrium
Describe the intra-atrial pathways in the conduction system
Correct Ans - - connect SA node to AV node
- conducts the impulse from SA node to AV node
Where are the intra-atrial pathways located on the heart Correct
Ans -
Describe the AV node in the conduction system Correct Ans - -
located on the floor of RA
