Cardiac ConductionHESI A2 cheat sheet

The heart's own wiring

9 key facts 3 practice questions Reviewed Oct 2026

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The Pathway

SA node — the pacemaker, in the right atrium
AV node — delays the signal so atria finish emptying
Bundle of His → bundle branches → Purkinje fibers

Rates

SA node ~60–100 beats per minute
AV node ~40–60 · Purkinje ~20–40 — backups, not leaders

The Ecg

P wave — atrial depolarization
QRS — ventricular depolarization
T wave — ventricular repolarization

Cardiac Output

CO = heart rate × stroke volume

Key takeaway

The heart's own wiring

Before you read

Test yourself first: 3 questions

Question 1 of 3

Cardiac muscle is unique because it is:

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