EKG certification Certification EKG Cardiac Anatomy & Physiology 1

Question 1

Where is the sinoatrial (SA) node located in the heart?

Accepted Answer

In the upper right atrium near the opening of the superior vena cava

Answer

In the interatrial septum near the fossa ovalis

Answer

At the apex of the right ventricle

Answer

Within the atrioventricular groove on the posterior surface

Question 2

What does the QRS complex on an EKG primarily represent?

Accepted Answer

Ventricular depolarization

Answer

Atrial depolarization

Answer

Ventricular repolarization

Answer

Conduction through the AV node

Question 3

Which structure is responsible for delaying the electrical impulse between the atria and ventricles?

Accepted Answer

Atrioventricular (AV) node

Answer

Bundle of His

Answer

Purkinje fibers

Answer

Right bundle branch

Question 4

The left ventricle has a thicker myocardial wall than the right ventricle primarily because it must:

Accepted Answer

Pump blood against the high resistance of the systemic circulation

Answer

Receive blood from the pulmonary veins at higher pressure

Answer

Filter blood before it enters the coronary arteries

Answer

Generate electrical impulses for the entire heart

Question 5

Which vessels supply oxygenated blood directly to the myocardium?

Accepted Answer

Coronary arteries

Answer

Pulmonary arteries

Answer

Thebesian veins

Answer

Thoracic aorta branches

Question 6

On a normal EKG, the T wave represents:

Accepted Answer

Ventricular repolarization

Answer

Atrial repolarization

Answer

Ventricular depolarization

Answer

Conduction through the bundle branches