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Cardiovascular Physiology: Electrical Impulse Conduction in the Heart

Explore the initiation and conduction of electrical impulses in the heart, tracing the conductive pathway and relating it to the cardiac cycle's mechanical events. Understand how these processes influence heart sounds and...

Questions: 6 | Attempts: 12 | Last updated: Aug 4, 2025

Sample Question 1
What are the specialised cells that initiate the electrical impulse in the heart?

Bundle of His is a collection of heart muscle cells responsible for transmitting electrical impulses from the AV node to the ventricles.

Sinoatrial node (pacemarker) is a group of specialised muscle cells under the superior vena cava in the top of the right atria

Purkinje fibers are specialized fibers located in the inner walls of the ventricles that carry the electrical impulses to the myocardium.

Atrioventricular node is a cluster of cells in the center of the heart responsible for transmitting electrical impulses between the atria and ventricles.

Sample Question 2
How is the electrical pathway initiated?

The Purkinje fibers begin the electrical pathway by conducting the action potential from the atria to the ventricles.

The sinoatrial node opens its sodium channels the fastest of any cardiac muscle cell which starts an action potential

The bundle of His is the first to open its sodium channels to begin the electrical pathway.

The atrioventricular node is responsible for initiating the electrical pathway in the heart.

Sample Question 3
What is the second node of the electrical pathway in the heart and what is its function?

The Purkinje fibers distribute the electrical signal rapidly throughout the ventricles.

The Sinoatrial node initiates the electrical signal in the heart.

The Bundle of His conducts the electrical signal to the ventricles.

There is an internodal pathway and the second node is the Atrioventricular node, which slows down the pulse allowing time for the ventricles to fill before contraction.

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