http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
The Anatomy and Physiology of Heart Sounds. The Cardiac Cycle Introduction
This instructional video, from the Cardiac Auscultation series produced by Medcom, Inc., is about variations in the cardiac cycle.
Title from resource description page (viewed March 20, 2017).