EKG review

What is repolarization in cardiac physiology?

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

• Repolarization is the phase where the heart muscle cells become excited and contract.

• Repolarization refers to the increase in heart rate during physical activity.

• Repolarization is the process of blood flowing into the heart chambers.

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 muscle.

What is the pericardium?

• A muscular layer that pumps blood to the body.

• The fibrous sac that surrounds and protects the heart.

• A type of valve in the heart that prevents backflow.

• The outermost layer of the heart that provides structural support.

What is diastole?

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

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

• The period of time when the heart is at rest and not beating.

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

What is the myocardium?

• The outer layer of the heart that protects it.

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

• The inner lining of the heart chambers.

• A type of heart valve that regulates blood flow.

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.

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

• 4

• 5

• 6

• 7

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 atria.

What does the T wave represent in an EKG?

• A. Atrial depolarization

• B. Ventricular repolarization

• C. Ventricular depolarization

• D. Atrial repolarization

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

• It represents atrial depolarization, which triggers atrial contraction.

• It represents ventricular depolarization, which is the electrical activity that triggers ventricular contraction.

• It indicates the heart rate and rhythm during exercise.

• It shows the repolarization of the ventricles after contraction.