Multiple Choice
Which component of the electrical conduction system of the heart is most responsible for the synchronized contraction of cardiac muscle tissue?
405
views
18. The Heart
Electrical Conduction System of the Heart
Multiple Choice
What is the correct sequence of travel by an impulse through the cardiac conduction system?
A
Bundle of His, Purkinje fibers, Atrioventricular node, Sinoatrial node
B
Purkinje fibers, Bundle of His, 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
Begin by understanding the role of the cardiac conduction system, which is responsible for initiating and coordinating the contraction of the heart muscle.
Identify the starting point of the impulse: the Sinoatrial (SA) node, located in the right atrium, is the natural pacemaker of the heart and initiates the electrical impulse.
Next, the impulse travels to the Atrioventricular (AV) node, which is located at the junction between the atria and ventricles. The AV node acts as a gatekeeper, delaying the impulse to allow the ventricles time to fill with blood.
From the AV node, the impulse moves to the Bundle of His, which is a pathway that transmits the impulse from the AV node to the ventricles.
Finally, the impulse travels through the Purkinje fibers, which are specialized conductive fibers that spread the impulse throughout the ventricles, causing them to contract and pump blood.
Related Videos
Related Practice
