EKG Technician Study Guide Test.
1. Endocardium The innermost layer of the heart, it forms the lining and folds back
onto itself to form the four valves. It is in this layer that the
conduction system is found
2. Myocardium Muscular layer of the heart
3. Epicardium The outermost layer of the heart. It is actually the inner layer of the
pericardium
4. Right atrium Receives deoxygenated blood returning to the heart from the body via
the superior vena cav which carries blood from the upper body and the
inferior vena cava which carries blood from the lower body.
5. Right ventricle Receives deoxygenated blood from the right atrium which pumps to
the lungs for oxygenation through the pulmonary artery (trunk) to the
right and left pulmonary arteries
6. Left atrium Receives oxygenated blood returning from the lungs via the right and
left pul- monary veins.
7. Left ventricle Receives the oxygenated blood from the left atrium and pumps it to the
body
through the aorta, the largest artery of the body.
8. The two Pulmonic valves and aortic valves
semilu- nar
valves
9. Heart Sounds S1 First heart sound is due to the closure of the mitral and tricuspid
valves
10. Heart Sounds S2 Second heart soudn is due to closure of the aortic and pulmonic
valves
11. Coronary arteries The arteries supplying the heart with blood
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, EKG Technician Study Guide Test.
12. Sympathetic Attects both the ventricles and atrium by increasing heart rate,
Ner- vous
conduction and irritability
System
Attects the atria only by decreasing heart rate, conduction and irritability
13. Parasympatheti
c Nervous
System
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16
, EKG Technician Study Guide Test.
14. Automaticity This is the ability of the cardiac cells to stimulate their own electrical impulse
without being stimulated from another source
15. Excitability Irritability, shared by all cardiac cells and it the ability to respond to
external
stimulus; electrical, chemical and mechanical
16. Conductivity This is the ability of all cardiac cellls to receive and electrical stimulus adn
transmit the stimulus ot the other cardiac cells
17. Contractility This is the ability of the cardiac cells to shorten and cause cardiac muscle
contrac- tion in response to an electrical stimulus
18. SA node Primary pacemaker of the heart, instrinisc rate of 60 -100 beats per
minute
19. AV node Located at the posterior septal wall of the right atrium, just above the
tricuspid valve. There is a 1/10th of a second delay of electrical activity at
this level to allow the blood to flow from the atria to the ventricles. Intrinsic
rate of 40-60 beats per minute
20. Bundle of His Found at the superior portion of the interventricular septum, it is the
pathway that leads to the SA node. Intrinsic rate 40-60 beats per
minute.
21. Bundle Branches Located at the interventricular septum. The bundle of His divides into
the right and left bundle branches. The function is to conduct the
electrical impulse to the purkinje fibers.
22. Purkinje Fibers Found within the ventricular endocardium. Instrinsic rate is 20-40 beats
per
minute.
23. Unipolar Leads
Precor- dial
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16
1. Endocardium The innermost layer of the heart, it forms the lining and folds back
onto itself to form the four valves. It is in this layer that the
conduction system is found
2. Myocardium Muscular layer of the heart
3. Epicardium The outermost layer of the heart. It is actually the inner layer of the
pericardium
4. Right atrium Receives deoxygenated blood returning to the heart from the body via
the superior vena cav which carries blood from the upper body and the
inferior vena cava which carries blood from the lower body.
5. Right ventricle Receives deoxygenated blood from the right atrium which pumps to
the lungs for oxygenation through the pulmonary artery (trunk) to the
right and left pulmonary arteries
6. Left atrium Receives oxygenated blood returning from the lungs via the right and
left pul- monary veins.
7. Left ventricle Receives the oxygenated blood from the left atrium and pumps it to the
body
through the aorta, the largest artery of the body.
8. The two Pulmonic valves and aortic valves
semilu- nar
valves
9. Heart Sounds S1 First heart sound is due to the closure of the mitral and tricuspid
valves
10. Heart Sounds S2 Second heart soudn is due to closure of the aortic and pulmonic
valves
11. Coronary arteries The arteries supplying the heart with blood
1/
16
, EKG Technician Study Guide Test.
12. Sympathetic Attects both the ventricles and atrium by increasing heart rate,
Ner- vous
conduction and irritability
System
Attects the atria only by decreasing heart rate, conduction and irritability
13. Parasympatheti
c Nervous
System
2/
16
, EKG Technician Study Guide Test.
14. Automaticity This is the ability of the cardiac cells to stimulate their own electrical impulse
without being stimulated from another source
15. Excitability Irritability, shared by all cardiac cells and it the ability to respond to
external
stimulus; electrical, chemical and mechanical
16. Conductivity This is the ability of all cardiac cellls to receive and electrical stimulus adn
transmit the stimulus ot the other cardiac cells
17. Contractility This is the ability of the cardiac cells to shorten and cause cardiac muscle
contrac- tion in response to an electrical stimulus
18. SA node Primary pacemaker of the heart, instrinisc rate of 60 -100 beats per
minute
19. AV node Located at the posterior septal wall of the right atrium, just above the
tricuspid valve. There is a 1/10th of a second delay of electrical activity at
this level to allow the blood to flow from the atria to the ventricles. Intrinsic
rate of 40-60 beats per minute
20. Bundle of His Found at the superior portion of the interventricular septum, it is the
pathway that leads to the SA node. Intrinsic rate 40-60 beats per
minute.
21. Bundle Branches Located at the interventricular septum. The bundle of His divides into
the right and left bundle branches. The function is to conduct the
electrical impulse to the purkinje fibers.
22. Purkinje Fibers Found within the ventricular endocardium. Instrinsic rate is 20-40 beats
per
minute.
23. Unipolar Leads
Precor- dial
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16
