EKG Cardiac Anatomy & Physiology Flashcards
6 cards from real EKG certification Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 EKG Cardiac Anatomy & Physiology flashcards as text
What is the primary function of the Purkinje fibers in cardiac conduction?
Answer: Rapidly distribute electrical impulses throughout the ventricles
Purkinje fibers rapidly transmit electrical impulses throughout the ventricular myocardium to ensure coordinated contraction from the apex upward.
Which EKG wave represents atrial depolarization?
Answer: P wave
The P wave on an EKG represents the electrical depolarization spreading through the right and left atria.
The interventricular septum receives its blood supply primarily from which coronary artery?
Answer: Left anterior descending artery
The left anterior descending artery supplies the anterior two-thirds of the interventricular septum through its septal perforating branches.
What percentage of cardiac output at rest is ejected with each ventricular contraction (ejection fraction)?
Answer: 55% to 70%
A normal resting ejection fraction is 55% to 70%, indicating the percentage of blood pumped out of the left ventricle with each contraction.
Which structure prevents the backflow of blood from the aorta into the left ventricle?
Answer: Aortic valve
The aortic semilunar valve closes after ventricular systole to prevent blood from flowing back into the left ventricle.
The T wave on an EKG tracing corresponds to which electrical event in the heart?
Answer: Ventricular repolarization
The T wave represents ventricular repolarization, the recovery phase during which the ventricles reset their electrical charge for the next contraction.