Which of the following is actually a coronary vein, not artery? Coronary Sinus Left Circumflex Left Anterior Descending Right Marginal Branch

## Step 1<br />The coronary veins are responsible for draining deoxygenated blood from the myocardium (heart muscle) back to the right atrium. The coronary arteries, on the other hand, supply oxygenated blood to the heart muscle.<br />## Step 2<br />Among the options provided, the Coronary Sinus is the only one that is a vein. It is the largest coronary vein and collects blood from the myocardium.<br />## Step 3<br />The Left Circumflex, Left Anterior Descending, and Right Marginal Branch are all coronary arteries, not veins.