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ECG CPO Questions and Correct
Answers/ Latest Update / Already
Graded
What is the pattern of blood flow through the heart?
Ans: Right atrium - Tricuspid valve - Right Ventricle - Pulmonic Valve -
Pulmonary Arteries - To the Lungs - Pulmonary Veins - Left atrium - Mitral
Valve - Left ventricle - Aortic valve - Aorta
What is the atrial kick?
Ans: This is atrial systole - The atrial kick delivers 20-30% of the blood volume
from the atria to the ventricles. The atria is contracting in response to the
SA node
What is the pericardial cavity?
Ans: Between the parietal and visceral layers of the heart is a potential
space. It contains serious fluid (pericardial fluid) which reduces friction.
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What is the epicardium?
Ans: It is the outer surface of the heart or inner serous layer of the
pericardial asc
What is the myocardium?
Ans: It is the middle layer of the heart and it is the muscular layer
What is the endocardium?
Ans: It is the inside layer that is nice and smooth. It helps the blood to flow
smoothly.
What are the five unique properties of myocardial tissue?
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Ans: 1) Automaticity
2) Rhythmicity
3) Conductivity
4) Contractility
5) Excitability
What does 'automaticity' of cardiac cells refer to?
Ans: It refers to their ability to initiate an impulse without an external source
of stimulation
It works without your brain instructing it to
How is the action potential generated?
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Ans: Phase 4: Resting membrane potential. Inside the cell is a high
concentration of K+. In this stage, K+ gates open and it starts to leak out.
Phase 0: Depolarization phase. Na+ enters the cell via fast sodium
channels - making the inside of the cell positive. K+ gates close.
Phase 1: Early repolarization - fast sodium channels close
Phase 2: Plateau phase - calcium moves into the cell, causing the cardiac
contraction along with the sodium. The influx helps to maintain the
positive charge over this time period.
Phase 3: Repolarization - K+ moves into the cell via the pump and the RMP
is re-established
What does the 'rhythmicity' of the cardiac cells refer to
Ans: It means that impulses are formed at regular intervals. The sodium
and potassium move at regular rates and then the cycle is repeated - its
regular
What does the 'conductivity' of the cardiac cells refer to?
ECG CPO Questions and Correct
Answers/ Latest Update / Already
Graded
What is the pattern of blood flow through the heart?
Ans: Right atrium - Tricuspid valve - Right Ventricle - Pulmonic Valve -
Pulmonary Arteries - To the Lungs - Pulmonary Veins - Left atrium - Mitral
Valve - Left ventricle - Aortic valve - Aorta
What is the atrial kick?
Ans: This is atrial systole - The atrial kick delivers 20-30% of the blood volume
from the atria to the ventricles. The atria is contracting in response to the
SA node
What is the pericardial cavity?
Ans: Between the parietal and visceral layers of the heart is a potential
space. It contains serious fluid (pericardial fluid) which reduces friction.
,2 | Page
What is the epicardium?
Ans: It is the outer surface of the heart or inner serous layer of the
pericardial asc
What is the myocardium?
Ans: It is the middle layer of the heart and it is the muscular layer
What is the endocardium?
Ans: It is the inside layer that is nice and smooth. It helps the blood to flow
smoothly.
What are the five unique properties of myocardial tissue?
,3 | Page
Ans: 1) Automaticity
2) Rhythmicity
3) Conductivity
4) Contractility
5) Excitability
What does 'automaticity' of cardiac cells refer to?
Ans: It refers to their ability to initiate an impulse without an external source
of stimulation
It works without your brain instructing it to
How is the action potential generated?
, 4 | Page
Ans: Phase 4: Resting membrane potential. Inside the cell is a high
concentration of K+. In this stage, K+ gates open and it starts to leak out.
Phase 0: Depolarization phase. Na+ enters the cell via fast sodium
channels - making the inside of the cell positive. K+ gates close.
Phase 1: Early repolarization - fast sodium channels close
Phase 2: Plateau phase - calcium moves into the cell, causing the cardiac
contraction along with the sodium. The influx helps to maintain the
positive charge over this time period.
Phase 3: Repolarization - K+ moves into the cell via the pump and the RMP
is re-established
What does the 'rhythmicity' of the cardiac cells refer to
Ans: It means that impulses are formed at regular intervals. The sodium
and potassium move at regular rates and then the cycle is repeated - its
regular
What does the 'conductivity' of the cardiac cells refer to?
