Which sequence correctly represents the cardiac conduction pathway starting at the SA node?

Study for the Paramedic Aandamp;P Exam. Engage with flashcards and multiple choice questions, complete with hints and explanations. Prepare effectively for your exam!

Multiple Choice

Which sequence correctly represents the cardiac conduction pathway starting at the SA node?

The sequence begins with the heart’s natural pacemaker, the sinoatrial node, which initiates the electrical impulse. It spreads through the atria to trigger atrial contraction, then reaches the atrioventricular node where there is a brief delay to allow the ventricles time to fill. From the AV node the impulse travels down the bundle of His, which conducts the signal to the right and left bundle branches and then into the Purkinje fibers that encircle the ventricles. This path ensures the ventricles are activated in a coordinated, rapid fashion after the atria have finished contracting. So, SA node → AV node → bundle of His → Purkinje fibers is the correct sequence.

The sequence begins with the heart’s natural pacemaker, the sinoatrial node, which initiates the electrical impulse. It spreads through the atria to trigger atrial contraction, then reaches the atrioventricular node where there is a brief delay to allow the ventricles time to fill. From the AV node the impulse travels down the bundle of His, which conducts the signal to the right and left bundle branches and then into the Purkinje fibers that encircle the ventricles. This path ensures the ventricles are activated in a coordinated, rapid fashion after the atria have finished contracting. So, SA node → AV node → bundle of His → Purkinje fibers is the correct sequence.

More practice questions