Question

Arrange these elements of the intrinsic conduction system in the order that a depolarizing impulse travels during a normal heartbeat. rank from first to last. do not overlap any tiles.

Answer 1

The arrangement are SA node, internal pathways, AV node, AV bundle, Bundle branches and Purkinje fibers. The anatomy of the intrinsic conduction system causes contraction of the ventricles to activate at the apex and move superiorly so blood is forced upward, toward the semilunar valves. 

Answer 2

During the normal heartbeat, the intrinsic conduction system starts from the SA node, then moves to internodal pathway, AV nodes, AV bundle, bundle branches, and ends at purkinje fibers.

Further Explanation:

The rhythm of the heartbeat is set by the intrinsic conduction system. It mainly composed of autorhythmic cardiac cell which helps in initiating the action potential in the heart. The sequence of rhythm of the heartbeat is:

SA Node              

• It is present in the upper right atrium.
• It helps in initiating the depolarization in the heart and develops action potential that transmits to the AV node.

Internodal Pathway

• It is present in the wall of atria.
• It helps in linking the SA node to the AV node
• Transmit the action potential to contractile cells.

AV node

• It is present in the inferior inter-atrial septum.
• In this, the transmission of the action potential is slow because of the contraction in atria.

AV Bundle

• It is a single connection between the ventricle and atria.
• Allowing the movement of action potential from interatrial septum to interventricular septum

Bundle Branches

• Transmit the action potential along the interventricular septum

Purkinje Fibers

• Contractile cells of ventricle receive the action potential from Purkinje fiber
• Subsequent contraction of the contractile cells is a mechanical event that causes a heartbeat

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Answer Details:

Grade: High School

Subject: Biology

Topic: Intrinsic Conduction System

Keywords:

Intrinsic conduction system, heartbeat, action potential, contractile cell, atria, ventricle, bundle branches, Purkinje fiber, AV bundle, AV node.