Cardiac Conduction System Quiz

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