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Type: Multiple-Choice
Category: Circulatory and Immune Systems
Level: College
Author: sarasmith2015
Last Modified: 8 years ago

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Circulatory and Immune Systems Question

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College Circulatory and Immune Systems

The                                            is the pacemaker that initiates each heart beat.
  1. sympathetic division of the nervous system
  2. autonomic nervous system
  3. sinoatrial node (SA)
  4. atrioventricular (AV) node
  5. cardiac conduction system