Emergency Medical Technician (EMT) Intermediate Practice Exam

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Prepare for the EMT Intermediate Exam. Utilize multiple choice questions with detailed explanations and hints. Get the confidence you need to pass your exam and advance your career in emergency medical services!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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What is the correct sequence of electrical conduction through the myocardium?

AV node, SA node, Bundle of His, bundle branches, Purkinje fibers
SA node, AV node, Bundle of His, bundle branches, Purkinje fibers
Bundle branches, SA node, AV node, Bundle of His, Purkinje fibers
AV node, Purkinje fibers, SA node, Bundle branches, Bundle of His

The correct answer is: SA node, AV node, Bundle of His, bundle branches, Purkinje fibers

The correct sequence of electrical conduction through the myocardium begins with the SA node, which acts as the natural pacemaker of the heart. This node generates electrical impulses that initiate the heartbeat. After the SA node, the electrical signal travels to the AV node, which serves as a critical delay point that allows the atria to fully contract and push blood into the ventricles before they contract. Following the AV node, the impulse moves into the Bundle of His, which transmits the signal to the ventricles through both bundle branches. Finally, the conduction pathway concludes with the Purkinje fibers, which distribute the electrical impulse throughout the ventricular myocardium, leading to coordinated contraction of the ventricles. Understanding this sequence is vital in the context of cardiac physiology, as any disruption in this conduction pathway can lead to arrhythmias or other cardiac dysfunction, which is a fundamental concept for EMTs when assessing patients with chest pain or other cardiac symptoms.