Q. What does the QRS complex represent in an ECG?
-
A.
Atrial depolarization
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B.
Ventricular depolarization
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C.
Ventricular repolarization
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D.
Atrial repolarization
Solution
The QRS complex represents ventricular depolarization, which is the electrical activation of the ventricles.
Correct Answer:
B
— Ventricular depolarization
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Q. What is defibrillation used for?
-
A.
To increase blood flow
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B.
To restore normal heart rhythm
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C.
To diagnose heart conditions
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D.
To measure heart rate
Solution
Defibrillation is used to restore normal heart rhythm in cases of life-threatening arrhythmias.
Correct Answer:
B
— To restore normal heart rhythm
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Q. What is the effect of an electrical shock on the heart?
-
A.
Increases heart rate
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B.
Decreases heart rate
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C.
Can cause arrhythmias
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D.
Has no effect
Solution
An electrical shock can disrupt the normal rhythm of the heart, potentially causing arrhythmias.
Correct Answer:
C
— Can cause arrhythmias
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Q. What is the primary function of the heart's electrical conduction system?
-
A.
To pump blood
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B.
To regulate heart rate
-
C.
To supply oxygen
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D.
To filter blood
Solution
The heart's electrical conduction system regulates heart rate by generating and conducting electrical impulses.
Correct Answer:
B
— To regulate heart rate
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Q. What is the primary risk of an electrical injury to the heart?
-
A.
Cardiac arrest
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B.
Heart murmur
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C.
Hypertension
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D.
Heart failure
Solution
The primary risk of an electrical injury to the heart is cardiac arrest, which can occur due to disruption of the heart's electrical system.
Correct Answer:
A
— Cardiac arrest
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Q. What is the term for the electrical activity of the heart as measured by an electrocardiogram (ECG)?
-
A.
Cardiac output
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B.
Heart rate
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C.
Electrophysiology
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D.
Myocardial infarction
Solution
Electrophysiology refers to the study of the electrical activity of the heart, which is measured by an ECG.
Correct Answer:
C
— Electrophysiology
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Q. Which device is used to monitor the heart's electrical activity continuously?
-
A.
Stethoscope
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B.
Holter monitor
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C.
Sphygmomanometer
-
D.
Pulse oximeter
Solution
A Holter monitor is used to continuously record the heart's electrical activity over a period of time.
Correct Answer:
B
— Holter monitor
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Q. Which electrolyte is crucial for the generation of electrical impulses in the heart?
-
A.
Calcium
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B.
Sodium
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C.
Potassium
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D.
Magnesium
Solution
Calcium is crucial for the generation of electrical impulses in the heart, facilitating muscle contraction.
Correct Answer:
A
— Calcium
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Q. Which part of the heart initiates the electrical impulse?
-
A.
Atrioventricular node
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B.
Sinoatrial node
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C.
Bundle of His
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D.
Purkinje fibers
Solution
The sinoatrial (SA) node initiates the electrical impulse that regulates the heartbeat.
Correct Answer:
B
— Sinoatrial node
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