EKG review

What does the P wave represent in an EKG?

• Atrial depolarization, which triggers atrial contraction.

• Ventricular depolarization, which triggers ventricular contraction.

• The resting state of the heart's electrical system.

• The repolarization of the ventricles.

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

• 4th intercostal space at the right side sternal border

• 2nd intercostal space at the left side sternal border

• 5th intercostal space at the midclavicular line

• 3rd intercostal space at the left side sternal border

What does the T wave represent in an EKG?

• A. Atrial depolarization

• B. Ventricular repolarization

• C. Ventricular depolarization

• D. Atrial repolarization

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

• It regulates blood flow to the lungs.

• It is the natural pacemaker of the heart that initiates the electrical impulses for heartbeats.

• It controls the contraction of the ventricles.

• It is responsible for the exchange of oxygen and carbon dioxide in the blood.

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

• 4 precordial leads

• 5 precordial leads

• 6 precordial leads

• 7 precordial leads

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

• The AV node generates electrical impulses for the heart.

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

• The AV node is responsible for pumping blood to the lungs.

• The AV node connects the atria and ventricles directly without delay.

What is the endocardium?

• The outer layer of the heart muscle.

• The inner lining of the heart chambers and valves.

• A type of heart valve.

• The muscle tissue of the heart.

What is the myocardium?

• The outer layer of the heart that protects it from infection.

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

• The inner lining of the heart that prevents blood from leaking.

• A type of heart valve that regulates blood flow.

What is depolarization in the context of cardiac physiology?

• The process of heart muscle relaxation.

• The electrical activation of heart cells that initiates the contraction of the heart muscle.

• The increase in heart rate due to adrenaline.

• The decrease in blood flow to the heart during exercise.

What is systole?

• The phase of the heartbeat when the heart muscle relaxes and fills with blood.

• The phase of the heartbeat when the heart muscle contracts and pumps blood out of the chambers.

• The phase of the heartbeat when the heart is at rest and not pumping blood.

• The phase of the heartbeat when the heart valves close to prevent backflow.