Explain how the conduction pathway in the heart coordinates the different stages of the cardiac cycle.

The conduction pathway, or system, of the heart begins with a process called, "normal excitation." The process of normal excitation begins in the sinoatrial node (SA), which is located in the upper portion of the atrium's right side. During this stage, the nodal cells of the SA create automatic depolarizations, which are responsible for generating a cardiac rhythm.
The depolarization process then spreads through the atria. Afterwards, the atrial depolarization disseminates to the atrioventricular node (AV). Then it passes through the bundle of what is called "His." At this stage, there is a longer interval between atrial and His bundle activation. Then excitation process--or the wave of cardiac depolarization--continues to the Purkinje fibers. These fibers are what composes the right and left bundle branches of the heart's lower portion. Finally, the ventricular muscle is activated
https://www.nottingham.ac.uk/nursing/practice/resources/cardiology/function/conduction.php