ECG Cardiac Anatomy 2

Question 1

Which valve separates the left atrium from the left ventricle?

Accepted Answer

Mitral valve

Answer

The mitral (bicuspid) valve controls blood flow from the left atrium into the left ventricle.

Question 2

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

Accepted Answer

Right atrium

Answer

The coronary sinus empties venous blood from the heart muscle directly into the right atrium.

Question 3

Which layer of the heart wall contains the cardiac muscle responsible for contraction?

Accepted Answer

Myocardium

Answer

The myocardium is the thick muscular middle layer that generates the contractile force of the heart.

Question 4

The right coronary artery most commonly supplies which structure critical for AV conduction?

Accepted Answer

AV node

Answer

In about 85–90% of people, the RCA supplies the AV node via the AV nodal artery.

Question 5

Which anatomical landmark divides the right and left sides of the heart externally on the anterior surface?

Accepted Answer

Anterior interventricular groove

Answer

The anterior interventricular groove (sulcus) overlies the interventricular septum and contains the LAD artery.

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