EKG certification Certification EKG Cardiac Anatomy & Physiology 2

Question 1

Which heart valve separates the left atrium from the left ventricle?

Accepted Answer

Mitral valve

Answer

The mitral (bicuspid) valve is located between the left atrium and left ventricle, preventing backflow during ventricular contraction.

Question 2

What is the normal duration of the PR interval on an EKG?

Accepted Answer

0.12 to 0.20 seconds

Answer

The PR interval normally measures 0.12 to 0.20 seconds and represents the time from atrial depolarization to the onset of ventricular depolarization.

Question 3

The coronary sinus drains deoxygenated blood from the cardiac veins into which chamber?

Accepted Answer

Right atrium

Answer

The coronary sinus empties deoxygenated blood from the myocardial circulation directly into the right atrium.

Question 4

Which layer of the heart wall is responsible for the contractile force during each heartbeat?

Accepted Answer

Myocardium

Answer

The myocardium is the thick muscular middle layer of the heart wall that generates the force needed to pump blood.

Question 5

During which phase of the cardiac cycle do the ventricles fill with blood passively?

Accepted Answer

Diastole

Answer

During diastole the ventricles relax and fill passively with blood flowing from the atria through the open AV valves.

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