EKG review

Front

What is depolarization in the context of cardiac physiology?

Back

Depolarization is the electrical activation of heart cells that initiates the contraction of the heart muscle.

Front

What is the myocardium?

Back

The myocardium is the middle muscular layer of the heart responsible for contracting and pumping blood.

Front

What does the T wave represent in an EKG?

Back

The T wave represents ventricular repolarization, which is the process of the ventricles recovering after contraction.

Front

Where is Lead V1 placed on the chest for an EKG?

Back

Lead V1 is placed in the 4th intercostal space at the right side sternal border.

Front

How many precordial leads are used in a 12 Lead ECG?

Back

There are 6 precordial (chest) leads in a 12 Lead ECG.

Front

What is the function of the SA node in the heart?

Back

The SA node, or sinoatrial node, is the natural pacemaker of the heart that initiates the electrical impulses for heartbeats.

Front

What is repolarization in cardiac physiology?

Back

Repolarization is the process by which heart muscle cells return to their resting state after depolarization.

Front

What is the role of the AV node in the heart's electrical conduction system?

Back

The AV node, or atrioventricular node, acts as a gatekeeper that slows down the electrical signal before it enters the ventricles.

Front

What does the P wave represent in an EKG?

Back

The P wave represents atrial depolarization, which is the electrical activity that triggers atrial contraction.

Front

What is the significance of the QRS complex in an EKG?

Back

The QRS complex represents ventricular depolarization, which is the electrical activity that triggers ventricular contraction.