Describe the sequence of cardiac conduction from SA node to Purkinje fibers.

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Multiple Choice

Describe the sequence of cardiac conduction from SA node to Purkinje fibers.

The sequence starts with the sinoatrial node in the right atrium, the heart’s natural pacemaker. From there, the impulse spreads through the atrial myocardium to the atrioventricular node at the junction of the atria and ventricles. The AV node introduces a brief delay, allowing the atria to contract and fill the ventricles. The signal then travels down the bundle of His, continues into the right and left bundle branches, and finally reaches the Purkinje fibers that distribute the impulse throughout the ventricular myocardium to coordinate contraction. This order—SA node → AV node → bundle of His → bundle branches → Purkinje fibers—matches the anatomical conduction path and ensures the correct timing of atrial and ventricular contractions.

The sequence starts with the sinoatrial node in the right atrium, the heart’s natural pacemaker. From there, the impulse spreads through the atrial myocardium to the atrioventricular node at the junction of the atria and ventricles. The AV node introduces a brief delay, allowing the atria to contract and fill the ventricles. The signal then travels down the bundle of His, continues into the right and left bundle branches, and finally reaches the Purkinje fibers that distribute the impulse throughout the ventricular myocardium to coordinate contraction. This order—SA node → AV node → bundle of His → bundle branches → Purkinje fibers—matches the anatomical conduction path and ensures the correct timing of atrial and ventricular contractions.

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