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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?
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?
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?
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?
Which of the following pathways directly connects the atria to the ventricles in the heart's conduction system?
What would be the most likely effect of damage to the internodal pathways on heart function?
What would be the most likely effect of damage to the internodal pathways on heart function?
Flashcards
Sinoatrial Node
Sinoatrial Node
The primary pacemaker of the heart that generates rhythmic impulses.
Internodal Pathways
Internodal Pathways
Pathways that conduct impulses from the sinoatrial node to the atrioventricular node.
Atrioventricular Node
Atrioventricular Node
A node that delays impulses from the atria before sending them to the ventricles.
A-V Bundle
A-V Bundle
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Purkinje Fibers
Purkinje Fibers
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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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