Phlebotomy Technician Practice Exam (NCPT/CPT) 2025 - Free Phlebotomy Practice Questions and Study Guide

The conduction system of the heart is responsible for the cardiac cycle, or the sequence of events in a single heartbeat. It is made up of five main parts or components the sinoatrial node, the atrioventricular node, the bundle of His, the bundle branches, and the Purkinje fibers. These components work together to coordinate and transmit electrical impulses throughout the heart, ensuring that it beats in a regular and organized manner. Option A, B, and D are incorrect as they do not accurately represent the number of components in the conduction system. Therefore, the correct answer is C, 5.