Ch 13 - Part 1 Heart Electrical Signal Pathway Explanation

The signal passes to the ______ bundle, also called the bundle of His, which connects the atria and the ventricles.

The signal then passes to the heart's ______ via bundle branches that are long cardiac myocytes whose only job is to act as an 'electrical highway' to the apex.

The signals spread throughout the ______, from the apex back up the lateral walls of the ventricles.

The change in voltage triggers a change in voltage in neighboring cells through the ______ fibers, causing a contraction.

The small delay of the signal at the ______ node is important because it causes a delay between the contraction of the atria and the contraction of the ventricles.

This gives the ______ time to close, preventing backflow of blood into the atria.

It is physiologically significant that the electrical signal goes from the ______ up.

Recall that contraction starts from the bottom and goes up because that is the ______ that blood flows.

The ______ node has a much greater role in setting the pace of the heart.

The electrical signal from the SA node at the tip of the right ______ passes to the AV node at the base of the right atrium, then jumps all the way down to the apex of the heart.