CRAT - Certified Rhythm Analysis Technician Cardiac Anatomy and Physiology Questions and Answers

Question 1

A rhythm analysis technician observes a patient's EKG.
The electrical impulse originates in the SA node, travels through the atria, and is then delayed at the AV node.
What is the next structure the impulse will travel to in the normal conduction pathway?

Accepted Answer

Bundle of His

Answer

Purkinje fibers

Answer

Right and left bundle branches

Answer

Ventricular myocardium

Question 2

Which heart valve is responsible for preventing the backflow of oxygenated blood from the left ventricle into the left atrium?

Accepted Answer

Mitral valve

Answer

Aortic valve

Answer

Pulmonary valve

Answer

Tricuspid valve

Question 3

A patient is experiencing a blockage in the right coronary artery (RCA). Which of the following structures is most likely to be affected?

Accepted Answer

SA node and right ventricle

Answer

Left ventricle and interventricular septum

Answer

Left atrium and circumflex artery

Answer

Anterior wall of the left ventricle

Question 4

During which phase of the cardiac cycle do the ventricles contract, forcing blood into the aorta and pulmonary artery?

Accepted Answer

Systole

Answer

Diastole

Answer

Isovolumetric relaxation

Answer

Ventricular filling

Question 5

Which of the following correctly describes the function of the Purkinje fibers?

Accepted Answer

To rapidly transmit electrical impulses to the ventricular myocardium, causing coordinated contraction.

Answer

To initiate the heartbeat as the primary pacemaker.

Answer

To delay the electrical impulse between the atria and ventricles.

Answer

To supply oxygenated blood directly to the heart muscle.

Question 6

On an EKG, the depolarization of the atria, which leads to their contraction, is represented by which waveform?

Accepted Answer

P wave

Answer

QRS complex

Answer

T wave

Answer

U wave