CET Cardiac Anatomy & Physiology 3

Question 1

Which vessel carries oxygenated blood from the lungs to the heart?

Accepted Answer

Pulmonary vein

Answer

The pulmonary veins (four total) return oxygenated blood from the lungs to the left atrium.

Question 2

The Bundle of His divides into which two structures?

Accepted Answer

Left and right bundle branches

Answer

The Bundle of His splits into the left and right bundle branches, which conduct impulses down the interventricular septum.

Question 3

What is the normal intrinsic firing rate of the AV node?

Accepted Answer

40–60 bpm

Answer

The AV node has an intrinsic escape rate of 40–60 bpm and serves as a backup pacemaker if the SA node fails.

Question 4

Which chamber of the heart has the thickest myocardial wall?

Accepted Answer

Left ventricle

Answer

The left ventricle has the thickest walls because it must generate enough pressure to pump blood through the systemic circulation.

Question 5

The T wave on an ECG represents which electrical event?

Accepted Answer

Ventricular repolarization

Answer

The T wave reflects ventricular repolarization, during which the ventricular myocardium resets for the next contraction.

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