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WorksheetsCardiac Conduction System Quiz
Total questions: 20
Worksheet time: 10mins
Which structure is the natural pacemaker of the heart?
AV Node
SA Node
Bundle of His
Purkinje Fibers
The conduction pathway in the heart begins at the?
Purkinje fibers
AV node
SA node
Ventricular wall
Which of the following is the correct conduction sequence?
SA node → AV node → Purkinje → Bundle of His
AV node → SA node → Bundle of His → Purkinje
SA node → AV node → Bundle of His → Purkinje fibers
AV node → Purkinje fibers → SA node → Bundle of His
The slowest conduction in the heart occurs at?
SA node
AV node
Bundle of His
Purkinje fibers
What is the function of Purkinje fibers?
Delay impulse
Transmit impulse to atria
Transmit impulse to ventricles
Generate impulse
Which part of the heart conduction system delays the impulse to allow atrial contraction?
SA node
AV node
Bundle of His
Purkinje fibers
What is the resting membrane potential of a ventricular cardiac muscle cell?
−40 mV
−60 mV
−90 mV
+30 mV
What ion is primarily responsible for the plateau phase of cardiac action potential?
Sodium
Potassium
Calcium
Chloride
Phase 0 of cardiac action potential is due to influx of?
Na⁺
K⁺
Ca²⁺
Cl⁻
The plateau phase of the cardiac action potential helps in?
Faster conduction
Prevention of tetany
Generating pacemaker potential
Increased automaticity
Normal value of cardiac output at rest in an average adult is?
3 L/min
5 L/min
6.5 L/min
2.5 L/min
Cardiac output is the product of?
Heart rate × Stroke volume
Heart rate × Blood pressure
Stroke volume × TPR
Venous return × Heart rate
Which of the following increases cardiac output?
Vagal stimulation
Decreased venous return
Sympathetic stimulation
Hypothermia
Cardiac output increases with?
Decreased blood volume
Bradycardia
Increased venous return
High afterload
Which factor directly increases stroke volume?
Increased afterload
Increased end-systolic volume
Increased preload
Decreased contractility
Which law explains the relationship between preload and stroke volume?
Marey's law
Frank-Starling law
Boyle’s law
LaPlace’s law
Which of the following methods can measure cardiac output?
ECG
Spirometry
Fick’s principle
Electroencephalogram
The Fick principle is based on?
Oxygen uptake
Heart rate
Blood pressure
Stroke volume
Which of the following affects cardiac output most rapidly?
Hormonal changes
Blood volume
Autonomic nervous system
Renin-angiotensin system
What is the main determinant of heart rate under resting conditions?
Parasympathetic tone
Sympathetic tone
Baroreceptors
Vagal inhibition
