Questions and Answers
What does the electric conduction system do?
What composes the entire electric conduction system?
SA and AV nodes, the internodal pathways, the Bundle of His, and the right & left bundle branches and anterior and posterior fascicles.
What is the role of the internodal pathway?
Carries electrical impulses from the SA node to the AV node, the right and left atria and stimulates atrial contraction.
What are the characteristics of muscle cells in the atria?
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Study Notes
Electric Conduction System
- Responsible for generating and propagating electrical impulses in the heart.
- Sustains rhythmic contractions essential for effective heart function.
Components of the System
- Comprises the SA node, AV node, internodal pathways, Bundle of His, and right & left bundle branches.
- Includes anterior and posterior fascicles, contributing to the overall conduction mechanism.
Internodal Pathway
- Facilitates the transmission of electrical impulses from the SA node to the AV node.
- Also relays signals to the right and left atria, triggering atrial contraction.
Atrial Muscle Cells
- Atrial muscle cells are characterized by large size and a significant negative resting potential.
- This configuration enables rapid depolarization and fast conduction of electrical impulses throughout the atria.
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Description
Test your knowledge about the heart's electric conduction system, including the key components such as the SA and AV nodes, and the internodal pathways. This quiz covers the definitions and functions critical for understanding cardiac physiology.
