Which of the labeled structures in the diagram of the heart action potential conduction system consists of specialized cardiac muscle cells that spontaneously create action potentials at a set rate? 
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Agency
An organization or unit within a government responsible for implementing policies and providing specific services.
Electoral Politics
The activities associated with the election of officials to government positions, including campaigns and voting.
Social Reform
Efforts aimed at making significant modifications to societal structures in order to address injustices and improve the collective well-being.
Actualized Policy
A policy that has been fully implemented and executed, turning theoretical plans into actual programs and actions.
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