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Questions and Answers
The signal passes to the ______ bundle, also called the bundle of His, which connects the atria and the ventricles.
The signal passes to the ______ bundle, also called the bundle of His, which connects the atria and the ventricles.
atrioventricular
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 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.
apex
The signals spread throughout the ______, from the apex back up the lateral walls of the ventricles.
The signals spread throughout the ______, from the apex back up the lateral walls of the ventricles.
ventricles
The change in voltage triggers a change in voltage in neighboring cells through the ______ fibers, causing a contraction.
The change in voltage triggers a change in voltage in neighboring cells through the ______ fibers, causing a contraction.
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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.
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.
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This gives the ______ time to close, preventing backflow of blood into the atria.
This gives the ______ time to close, preventing backflow of blood into the atria.
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It is physiologically significant that the electrical signal goes from the ______ up.
It is physiologically significant that the electrical signal goes from the ______ up.
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Recall that contraction starts from the bottom and goes up because that is the ______ that blood flows.
Recall that contraction starts from the bottom and goes up because that is the ______ that blood flows.
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The ______ node has a much greater role in setting the pace of the heart.
The ______ node has a much greater role in setting the pace of the heart.
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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.
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.
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