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
Which heart valve separates the left atrium from the left ventricle?
Answer: Mitral valve
The mitral (bicuspid) valve is located between the left atrium and left ventricle, preventing backflow during ventricular contraction.
What is the normal duration of the PR interval on an EKG?
Answer: 0.12 to 0.20 seconds
The PR interval normally measures 0.12 to 0.20 seconds and represents the time from atrial depolarization to the onset of ventricular depolarization.
The coronary sinus drains deoxygenated blood from the cardiac veins into which chamber?
Answer: Right atrium
The coronary sinus empties deoxygenated blood from the myocardial circulation directly into the right atrium.
Which layer of the heart wall is responsible for the contractile force during each heartbeat?
Answer: Myocardium
The myocardium is the thick muscular middle layer of the heart wall that generates the force needed to pump blood.
During which phase of the cardiac cycle do the ventricles fill with blood passively?
Answer: Diastole
During diastole the ventricles relax and fill passively with blood flowing from the atria through the open AV valves.
The right coronary artery primarily supplies blood to which structure critical for the heart's electrical conduction?
Answer: SA node and AV node
In most people the right coronary artery supplies blood to both the SA node and the AV node, making it critical for normal cardiac rhythm.