CST Exam Review Question no. 711 February 8, 2018 By Rana Waqar Leave a Comment The SA node, which initiates each cardiac cycle, is known as the: a. bundle of His b. Purkinje fibers c. superior vena cava d. pacemaker Δ For More questions please join Our facebook group: https://www.facebook.com/groups/1424167527615419/?ref=group_browse_new
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