What term describes the baseline level of electrical activity on an EKG?

The term that describes the baseline level of electrical activity on an EKG is the isoelectric line. This line represents the period when there is no net electrical activity occurring within the heart, essentially indicating that the electrical activity is at rest. During this phase, the voltage readings on the EKG remain stable, providing a reference point against which other events, such as depolarization and repolarization of the heart muscle, can be measured. Understanding the isoelectric line is crucial for interpreting the various phases and abnormalities in the heart’s electrical activity as shown on the EKG. It serves as the baseline from which changes in electrical activity, such as the P wave, QRS complex, and T wave, can be evaluated.