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18.5 Pacemaker cells trigger action potentials throughout the heart: Human Anatomy and Physiologyhttps://etext.pearson.com/#/book/15HFPI4MAJ?deeplink=true&platforms_id=mastering&idpName=SMS&contextId=MAPNICKE65893&smsUserId=69553775&courseName=Summer%202016%20BIO%20202&tool_consumer_instance_guid=etext2.0&lti_message_type=basic-lti-launch-request&lti_version=LTI-1p0&custom_bookid=15HFPI4MAJ&custom_smsid=69553775&context_id=MAPNICKE65893&custom_error_url=https://session.masteringaandp.c...