Question

Which of the following statements are TRUE regarding the coronary circulation?

A. The RCA, the LAD coronary artery, and the LCX are the major "Truck" arteries that supply large areas of the heart.
B. The right and left coronary arteries originate from the aorta.
C. The heart protects itself with cross-connections between arteries (collateral circulation). The majority of myocardial blood flow occurs during diastole.
D. All of the above are true.

Answer 1

All of the statements provided are true regarding the coronary circulation: major arteries include the RCA, LAD, and LCX; the right and left coronary arteries originate from the aorta; the heart has collateral circulation, and myocardial blood flow mostly occurs during diastole.

Step-by-step explanation:

The statement that all of the following are true regarding the coronary circulation is correct. Specifically:

• The RCA (Right Coronary Artery), the LAD (Left Anterior Descending) coronary artery, and the LCX (Left Circumflex) are indeed the major arteries that supply large areas of the heart.
• The right and left coronary arteries originate from the aorta and are the first vessels that branch from the ascending aorta, arising from two of the three sinuses just superior to the aortic semilunar valve, as the left coronary artery arises from the left posterior aortic sinus and the right coronary artery arises from the anterior aortic sinus.
• The heart does protect itself with cross-connections between arteries, known as collateral circulation. The majority of myocardial blood flow indeed occurs during diastole when the heart muscle is relaxed, which allows for more efficient perfusion of the coronary arteries.