<prompt> Impulses from SA node to the left atrium and AV node passes through:Bundle of HisBachmann bundlePurkinje fibresNone  <response>: There are three bundles of atrial fibers that contain Purkinje-type fibers and connect the SA node to the AV node: the anterior, middle tract of Wenckebach, and posterior tract of Thorel tracts.Bachmann bundle is sometimes used to identify a branch of the anterior internodal tract that connects the right and left atria. Key Concept3 INTERNODAL TRACTS:Connects SA node to AV node:Anterior Bachmans bundleMiddle Wenckebachs bundlePosterior Thorels bundleReference: Ganongs Review of Medical Physiology T W E N T Y - F I F T H E D I T I O N page no 519 