ECG Cardiac Anatomy 5

Question 1

The left main coronary artery bifurcates into which two vessels?

Accepted Answer

LAD and LCx

Answer

RCA and LCx

Answer

LAD and RCA

Answer

LCx and obtuse marginal

Question 2

Which structure prevents the AV valves from prolapsing into the atria during ventricular contraction?

Accepted Answer

Papillary muscles and chordae tendineae

Answer

Annulus fibrosus

Answer

Trabeculae carneae

Answer

Bundle of His

Question 3

In a right-dominant coronary circulation (most common), the posterior descending artery (PDA) arises from which vessel?

Accepted Answer

Right coronary artery

Answer

Left anterior descending

Answer

Left circumflex

Answer

Obtuse marginal

Question 4

Which ECG finding is characteristic of right ventricular hypertrophy related to cor pulmonale?

Accepted Answer

Right axis deviation with tall R in V1

Answer

Tall R waves in V5–V6

Answer

Left axis deviation with broad S in V1

Answer

Delta waves in V1–V3

Question 5

The fibrous skeleton of the heart serves which primary function?

Accepted Answer

Provides electrical insulation between atria and ventricles

Answer

Generates action potentials for conduction

Answer

Stores energy for diastolic recoil

Answer

Anchors coronary artery origins

Question 6

Which chamber receives deoxygenated blood returning from the head and upper extremities via the superior vena cava?

Accepted Answer

Right atrium

Answer

Left atrium

Answer

Left ventricle

Answer

Right ventricle

Question 7

Aortic stenosis causes pressure overload primarily in which chamber?

Accepted Answer

Left ventricle

Answer

Right ventricle

Answer

Left atrium

Answer

Right atrium