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Conduction System of the Heart

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Questions and Answers

What is the conduction system in the heart?

The conduction system refers to the structures in the heart that create and transmit an electrical impulse, forcing the atria and ventricles to contract.

What is the role of the sino-atrial node (SA node) in the conduction system?

The SA node generates the electrical impulse and fires it through the atrial wall, causing both the left and right atria to contract.

What is the function of the atrio-ventricular node (AV node) in the conduction system?

The AV node collects the impulse from the SA node and delays the transmission of the impulse by 0.1 seconds until the atria have finished contracting.

What is the bundle of His in the conduction system?

The bundle of His is a central structure in the heart that the electrical impulse travels down. Signup and view all the answers

What happens to the electrical impulse in the bundle of His?

The electrical impulse splits in two in the bundle of His. Signup and view all the answers

What are the bundle branches in the conduction system?

The bundle branches are left and right branches that carry the impulse up the left and right ventricles. Signup and view all the answers

What is the role of Purkyne fibres in the conduction system?

Purkyne fibres distribute the impulse through the ventricle walls, causing the ventricles to contract. Signup and view all the answers

What is the term for the heart's ability to generate its own electrical impulse?

Myogenic Signup and view all the answers

How long does the AV node delay the transmission of the impulse?

0.1 seconds Signup and view all the answers

Study Notes

Conduction System of the Heart

The conduction system includes the structures responsible for generating and transmitting electrical impulses in the heart.
Myogenic refers to the heart's ability to initiate its own contractions without external stimuli.

Key Components of the Conduction System

Sino-atrial node (SA node):
- Located in the right atrial wall.
- Generates electrical impulses, triggering simultaneous contraction of both the left and right atria.
Atrio-ventricular node (AV node):
- Receives the impulse from the SA node.
- Delays the transmission by 0.1 seconds, allowing the atria to finish contracting before the ventricles are stimulated.
Bundle of His:
- Positioned in the septum of the heart.
- The electrical impulse travels down this central structure, splitting into left and right branches.
Bundle branches:
- The left and right branches conduct the impulse to the respective ventricles.
Purkinje fibres:
- Distribute the impulse throughout the ventricle walls.
- Responsible for causing the ventricles to contract in response to the electrical signals.

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Description

Learn about the conduction system, its structure, and how it regulates the heartbeat. Understand the role of electrical impulses in contracting the atria and ventricles. Test your knowledge on this crucial aspect of the cardiovascular system.