CCS CCS Cardiac Anatomy and Physiology 3

Question 1

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

Accepted Answer

Right atrium

Answer

The coronary sinus empties myocardial venous blood into the right atrium, near the tricuspid valve annulus.

Question 2

Which aortic root structure is directly adjacent to the non-coronary cusp of the aortic valve?

Accepted Answer

Mitral valve anterior leaflet

Answer

The anterior (aorto-mitral) curtain connects the non-coronary cusp region of the aortic annulus to the anterior leaflet of the mitral valve.

Question 3

Which of the following best describes systemic vascular resistance (SVR)?

Accepted Answer

The resistance to flow in the systemic circulation that determines afterload

Answer

SVR is the resistance in the systemic circulation and is the primary determinant of left ventricular afterload.

Question 4

The atrioventricular (AV) node is typically supplied by which coronary artery in right-dominant hearts?

Accepted Answer

Right coronary artery

Answer

In right-dominant hearts, the AV node artery arises from the right coronary artery at the crux of the heart.

Question 5

Which phase of the cardiac cycle corresponds to the period of highest myocardial oxygen consumption?

Accepted Answer

Isovolumetric contraction

Answer

Isovolumetric contraction requires high energy to develop pressure against a closed aortic valve without ejecting blood.

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