EKG Technician Study Guide Exam
Questions and Answers11
Endocardium - ANSWERS-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
Myocardium - ANSWERS-Muscular layer of the heart
Epicardium - ANSWERS-The outermost layer of the heart. It is actually the inner layer of the
pericardium
Right atrium - ANSWERS-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.
Right ventricle - ANSWERS-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
Left atrium - ANSWERS-Receives oxygenated blood returning from the lungs via the right and
left pulmonary veins.
Left ventricle - ANSWERS-Receives the oxygenated blood from the left atrium and pumps it to
the body through the aorta, the largest artery of the body.
The two semilunar valves - ANSWERS-Pulmonic valves and aortic valves
, Heart Sounds S1 - ANSWERS-First heart sound is due to the closure of the mitral and tricuspid
valves
Heart Sounds S2 - ANSWERS-Second heart soudn is due to closure of the aortic and pulmonic
valves
Coronary arteries - ANSWERS-The arteries supplying the heart with blood
Sympathetic Nervous System - ANSWERS-Affects both the ventricles and atrium by increasing
heart rate, conduction and irritability
Parasympathetic Nervous System - ANSWERS-Affects the atria only by decreasing heart rate,
conduction and irritability
Automaticity - ANSWERS-This is the ability of the cardiac cells to stimulate their own electrical
impulse without being stimulated from another source
Excitability - ANSWERS-Irritability, shared by all cardiac cells and it the ability to respond to
external stimulus; electrical, chemical and mechanical
Conductivity - ANSWERS-This is the ability of all cardiac cellls to receive and electrical stimulus
adn transmit the stimulus ot the other cardiac cells
Contractility - ANSWERS-This is the ability of the cardiac cells to shorten and cause cardiac
muscle contraction in response to an electrical stimulus
SA node - ANSWERS-Primary pacemaker of the heart, instrinisc rate of 60 -100 beats per minute
Questions and Answers11
Endocardium - ANSWERS-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
Myocardium - ANSWERS-Muscular layer of the heart
Epicardium - ANSWERS-The outermost layer of the heart. It is actually the inner layer of the
pericardium
Right atrium - ANSWERS-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.
Right ventricle - ANSWERS-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
Left atrium - ANSWERS-Receives oxygenated blood returning from the lungs via the right and
left pulmonary veins.
Left ventricle - ANSWERS-Receives the oxygenated blood from the left atrium and pumps it to
the body through the aorta, the largest artery of the body.
The two semilunar valves - ANSWERS-Pulmonic valves and aortic valves
, Heart Sounds S1 - ANSWERS-First heart sound is due to the closure of the mitral and tricuspid
valves
Heart Sounds S2 - ANSWERS-Second heart soudn is due to closure of the aortic and pulmonic
valves
Coronary arteries - ANSWERS-The arteries supplying the heart with blood
Sympathetic Nervous System - ANSWERS-Affects both the ventricles and atrium by increasing
heart rate, conduction and irritability
Parasympathetic Nervous System - ANSWERS-Affects the atria only by decreasing heart rate,
conduction and irritability
Automaticity - ANSWERS-This is the ability of the cardiac cells to stimulate their own electrical
impulse without being stimulated from another source
Excitability - ANSWERS-Irritability, shared by all cardiac cells and it the ability to respond to
external stimulus; electrical, chemical and mechanical
Conductivity - ANSWERS-This is the ability of all cardiac cellls to receive and electrical stimulus
adn transmit the stimulus ot the other cardiac cells
Contractility - ANSWERS-This is the ability of the cardiac cells to shorten and cause cardiac
muscle contraction in response to an electrical stimulus
SA node - ANSWERS-Primary pacemaker of the heart, instrinisc rate of 60 -100 beats per minute
