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Specialized Cardiac Conduction System

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Questions and Answers

What is the primary function of the sinoatrial (S-A) node within the heart's specialized excitatory and conductive system?

To conduct impulses from the atria into the ventricles.

To conduct cardiac impulses to all parts of the ventricles.

To delay impulses from the atria before they enter the ventricles.

To generate normal rhythmical impulses. (correct)

Which component of the heart's conduction system is responsible for delaying the electrical impulse before it passes from the atria to the ventricles?

The Purkinje fibers.

The sinus node (S-A node).

The internodal pathways.

The atrioventricular (A-V) node. (correct)

What is the role of the Purkinje fibers in the heart's electrical conduction system?

Delaying impulses before they pass into the ventricles.

Conducting impulses from the sinus node to the A-V node.

Conducting cardiac impulses to all parts of the ventricles. (correct)

Conducting impulses from the atria into the ventricles.

Which of the following pathways directly connects the atria to the ventricles in the heart's conduction system?

<p>The A-V bundle. (A)</p> Signup and view all the answers

What would be the most likely effect of damage to the internodal pathways on heart function?

<p>The transmission of impulses from the sinus node to the A-V node slows down. (C)</p> Signup and view all the answers

Flashcards

Sinoatrial Node

The primary pacemaker of the heart that generates rhythmic impulses.

Internodal Pathways

Pathways that conduct impulses from the sinoatrial node to the atrioventricular node.

Atrioventricular Node

A node that delays impulses from the atria before sending them to the ventricles.

A-V Bundle

The structure that carries impulses from the atria into the ventricles.

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Purkinje Fibers

Fibers that convey cardiac impulses to all parts of the ventricles.

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Study Notes

Specialized Cardiac Conduction System

The heart's specialized conduction system initiates and coordinates its rhythmic contractions.
The sinus node (SA node) is the heart's natural pacemaker, generating electrical impulses.
Internodal pathways transmit impulses from the sinus node to the atrioventricular (AV) node.
The AV node delays the impulse before it reaches the ventricles, allowing the atria to contract completely.
The AV bundle (bundle of His) carries the impulse from the atria to the ventricles.
The left and right bundle branches further transmit the impulse.
Purkinje fibers distribute the impulse throughout the ventricles causing coordinated ventricular contraction.

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Description

Explore the intricate details of the heart's specialized conduction system in this quiz. Understand how the sinus node functions as the natural pacemaker and how impulses travel through the heart's pathways to ensure coordinated contractions. Test your knowledge on the roles of the AV node, bundle of His, and Purkinje fibers.