Electrical impulses of the cardiac cycle produce a series of waves with peaks and valleys on an electrocardiogram that are called ________.

Cardiac Cycle

The sequence of events in the heart during one heartbeat, including contraction and relaxation phases that circulate blood throughout the body.

Electrocardiogram

A test that measures the electrical activity of the heart to check for heart disease.

Waves

Oscillations or movements that transfer energy from one place to another, found in physical and electromagnetic contexts.