Multiple Choice
What is the priority intervention for a patient in ventricular fibrillation?
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18. The Heart
Electrical Conduction System of the Heart
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Which of the following is the correct sequential path of an action potential in the heart?
A
Purkinje fibers, Bundle of His, Atrioventricular node, Sinoatrial node
B
Bundle of His, Purkinje fibers, Sinoatrial node, Atrioventricular node
C
Atrioventricular node, Sinoatrial node, Purkinje fibers, Bundle of His
D
Sinoatrial node, Atrioventricular node, Bundle of His, Purkinje fibers
Verified step by step guidance1
Understand that the heart's electrical conduction system is responsible for initiating and propagating action potentials that lead to heart contractions.
Identify the primary pacemaker of the heart, which is the Sinoatrial (SA) node. It initiates the action potential.
Recognize that the action potential travels from the SA node to the Atrioventricular (AV) node. The AV node acts as a gatekeeper, slowing the impulse before it moves to the ventricles.
From the AV node, the action potential travels to the Bundle of His, which is a pathway that conducts the impulse to the ventricles.
Finally, the action potential moves through the Purkinje fibers, which distribute the impulse throughout the ventricles, causing them to contract.
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