EKG certification Certification EKG Cardiac Anatomy & Physiology 3

Question 1

What is the primary function of the Purkinje fibers in cardiac conduction?

Accepted Answer

Rapidly distribute electrical impulses throughout the ventricles

Answer

Generate the initial electrical impulse

Answer

Delay conduction between the atria and ventricles

Answer

Conduct impulses from the SA node to the AV node

Question 2

Which EKG wave represents atrial depolarization?

Accepted Answer

P wave

Answer

QRS complex

Answer

T wave

Answer

U wave

Question 3

The interventricular septum receives its blood supply primarily from which coronary artery?

Accepted Answer

Left anterior descending artery

Answer

Right coronary artery

Answer

Left circumflex artery

Answer

Posterior descending artery

Question 4

What percentage of cardiac output at rest is ejected with each ventricular contraction (ejection fraction)?

Accepted Answer

55% to 70%

Answer

30% to 40%

Answer

80% to 90%

Answer

10% to 20%

Question 5

Which structure prevents the backflow of blood from the aorta into the left ventricle?

Accepted Answer

Aortic valve

Answer

Mitral valve

Answer

Pulmonic valve

Answer

Tricuspid valve

Question 6

The T wave on an EKG tracing corresponds to which electrical event in the heart?

Accepted Answer

Ventricular repolarization

Answer

Atrial depolarization

Answer

Ventricular depolarization

Answer

Atrial repolarization